DPDP Rules 2025: Third-party data–fuelled ad-tech faces a tough challenge

With the implementation of the Digital Personal Data Protection (DPDP) Rules 2025, India’s digital economy has taken a definitive step forward. The rules operationalize the DPDP Act, 2023, India’s first comprehensive privacy law that introduced verifiable consent, purpose limitation, obligatory one-year data retention, parental consent for minors, breach reporting within 72 hours, and a completely digital Data Protection Board. For regular users of WhatsApp, Instagram, Facebook, Amazon, Flipkart, UPI apps, or government portals, this translates into increased transparency and power over the manner in which their data are gathered and utilized.

But beneath the regulatory architecture lies a sharp tension point that could reshape the economics of India’s digital advertising market. Ad-tech companies whose models pivot on third-party data now face unprecedented compliance pressure, because the DPDP regime requires them to validate that every data point they process was originally collected through explicit, lawful consent. They must also ensure that consent provenance, accuracy, purpose and onward sharing are fully compliant. In a sector where data often flows through publishers, SDK providers, intermediaries and multiple processors, this is nothing short of a structural shock.

This pressure point defines the new chapter of ad-tech in India, marking the transition from data abundance to consented scarcity.

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India Integrates Into the Global Privacy Order Through DPDP

The DPDP law mirrors global frameworks like GDPR and CCPA. Vipul Kedia, COO, India & Emerging Markets at Affle, cites India’s move within this international pivot. “The global digital ecosystem has moved towards stronger privacy governance with the global standards of GDPR and CCPA, and India’s DPDP Act marks a significant step in strengthening user rights and consent-led data usage,” he said. According to Kedia, the industry is inevitably shifting toward “consented, high-quality, and privacy-validated partner data, supported by stronger contractual controls and audit mechanisms.” He added that this shift will accelerate the adoption of privacy-first alternatives such as contextual signals, on-device intelligence, AI-based intent modelling and consented first-party ecosystems.

Kedia’s perspective reflects a growing consensus: the companies that have already internalised global privacy norms will experience less friction adapting to DPDP. Affle, for instance, underscores its ISO/IEC 27001:2022 certification and Singapore’s Data Protection Trustmark as evidence of its privacy-by-design credentials.

In this new ecosystem, the advantage shifts decisively towards companies that own deep, consented first-party datasets.

Karan Taurani at Elara Securities highlights this tilt, noting that the DPDP Bill “will provide structural benefits to companies that operate on robust first-party data ecosystems.” He explained that platforms like Zomato, Nykaa and Paytm may have smaller MAUs than global giants, but their user data is “deeper, richer and more purchase-linked,” making it highly valuable in a privacy-safe advertising environment. E-commerce platforms such as Amazon and Flipkart, with their extensive behavioural and transaction-led first-party data, are also positioned for stronger monetisation in the medium term.

A Law That Rewires the Plumbing of Digital Advertising

The DPDP framework deliberately closes the loopholes that once allowed third-party data to circulate through the ecosystem with limited scrutiny. Ad-tech companies have long depended on device IDs, cookies, MAIDs, hashed emails, SDK signals, and cross-platform identifiers provided by external partners. Under DPDP, every one of these identifiers is treated as personal data if it relates to or identifies an individual.

Sanket Savaliya, an industry expert with over a decade of experience, underscored how transformational this shift is for the ad-tech ecosystem. He noted that companies must now meticulously “map data flows and roles, classify activities where your entity is a data fiduciary versus processor, including SDKs, pixels, tags and server-to-server connections, and identify all downstream recipients.” He added that when data is shared between fiduciaries, the originator must ensure completeness and accuracy, particularly when the data is used for decision-making or further sharing. In his view, the broad definition of personal data means even “device IDs, MAIDs and hashed contact data fall into scope when they identify or relate to a person,” making repurposing impossible without renewed consent.

This means the long-running performance marketing playbook dependent on opaque data supply chains must now be rewritten. The law demands that companies know not only what data they hold but how their partners sourced it. For the first time, an ad-tech intermediary must prove lawful origins, not merely assume them.

The End of Aggressive Scaling: Marketing Ambition Meets Legal Reality

The DPDP rules enforce strict boundaries on what is permissible in digital advertising. Legal obligations of consent, purpose limitation, accuracy, retention and accountability will now override aggressive marketing ambitions that once depended heavily on tracking, profiling and cross-platform identifiers.

Savaliya noted that this aligns with global regulatory momentum, from Europe’s DMA and DSA to platform-driven initiatives like Privacy Sandbox. He warned that “legal obligations will increasingly override marketing ambitions in adtech,” and marketing success must now be achieved within the constraints of consent-led, compliance-first practices rather than attempts to bypass them. This represents a major cultural shift for an industry long rewarded for scale, reach and intricate behavioural profiling.

The DPDP rules also make it clear that large-scale personalised advertising cannot continue unchecked. Explicit, purpose-specific consent will determine who can be targeted and how.

This creates an immediate operational impact as the user acquisition funnel may narrow substantially. But experts argue that while the pool of targetable users may shrink, the quality of signals from consenting users will increase, improving attribution, conversion rates and ROAS over the long term. The trade-off moves from quantity to verifiable quality.

First-Party Data Becomes the New Market Power

Taurani added that third-party data players must invest in building their own first-party datasets or face rising compliance costs and sourcing constraints. With penalties reaching up to ₹2.5 billion or 5% of turnover, he expects companies to strengthen consent governance, internal controls, and breach-response protocols, especially given that breaches must be reported to both the Data Protection Board and affected users.

This places third-party ad-tech intermediaries at a crossroads: either restructure around consent-led first-party assets or risk declining relevance.

A New Playbook Emerges: Clean Rooms, Cohorts and Consent-First Measurement

Beyond compliance, the DPDP Act is accelerating a deep reshaping of the tools and tactics the ad-tech ecosystem has long relied on. Tejas Tamhane, an adtech business consultant, notes that the sector is now entering a phase where entire categories of third-party providers will simply not survive the DPDP era. “Ad-tech businesses will phase out third-party providers that can’t prove specific, informed consent or support revocation and deletion,” she said, adding that first-party and zero-party data will naturally take precedence because they are “easy to explain, prove, and revoke.” According to her, the riskiest models are those that depend on cross-app, SDK-harvested data aggregation without transparent consent trails or user-level erasure workflows, precisely the pipelines most exposed under the new law.

Tamhane expects the industry to shift toward dual-first-party clean rooms for deterministic attribution wherever consented identifiers are available, and toward modelled outcome measurement such as MMM, incrementality testing, A/B holdouts and geo-lift, when user-level tracking isn’t permissible. In her view, logged-in, consented ecosystems spanning Big Tech, retail media networks, connected devices and CTV will become the backbone of end-to-end measurement, while everything beyond that will rely on privacy APIs and aggregated reporting. Retargeting, too, will undergo a fundamental transformation. “Retargeting will narrow to consented, publisher-defined cohorts rather than user-level IDs, especially where DPDP limits personal data use,” she said. This shift, she believes, ultimately advantages publishers that command high-quality, authenticated audiences, giving them a stronger position in a privacy-first marketplace.

A Sector Forced to Reinvent Itself

An industry expert summed up the new operational landscape, observing that the DPDP Act “fundamentally changes the landscape for ad-tech companies that rely on third-party data.” He said companies must “update notices and consent flows, audit all tags and pixels, review SDK frameworks, assess cross-border transfers, and implement retention, deletion and purpose-limitation,” while leadership must embed privacy-by-design and ensure the board is fully briefed on data risks. In his view, brands that pivot toward transparent first-party data strategies, clean rooms and privacy-centric measurement will be best positioned to convert compliance into trust-driven competitive advantage.

As the DPDP compliance architecture rolls out over the next 18 months, the ad-tech ecosystem faces a defining shift. Some companies will rebuild, strengthening governance and investing in privacy-first innovation. Others who are heavily dependent on patchwork third-party signals might find the adaptation tedious.

The reality is clear that the era of abundant, loosely governed third-party data has ended. India’s digital advertising market is now entering a phase defined by consent, provenance and accountability. And for ad-tech firms, the difference between merely surviving and leading will depend on how quickly and rigorously they respond to this new, unambiguous regulatory frontier.