The Rise of First-Party Data Amid the Cookie Phaseout
How first-party data went from a back-office concern to a core strategy, traced through GDPR, Apple's tracking limits and Google's 2020 cookie announcement.
First-party data, information a business collects directly from its own customers rather than buying or licensing from a third party, isn’t a new idea. What changed between roughly 2017 and 2021 is that it went from a secondary asset to the foundation marketers were told to build everything else around. That shift didn’t happen in a single moment. It built up through a series of regulatory and platform decisions, each one narrowing what third-party tracking could do.
The early cracks: Apple’s Intelligent Tracking Prevention
Apple began restricting cross-site cookie tracking in Safari with Intelligent Tracking Prevention in 2017, and kept tightening it through several updates over the following years, ITP 2.1 in 2019 cut the lifespan of first-party cookies set via JavaScript, and later versions closed workarounds ad tech companies had found. Safari’s share of mobile browsing was large enough that these changes quietly degraded the reliability of cookie-based retargeting years before most marketers were paying close attention.
The regulatory turn: GDPR and CCPA
The EU’s General Data Protection Regulation took effect in May 2018, and for the first time gave a major regulator real enforcement teeth over how companies collected and used personal data, with fines scaling to a percentage of global revenue. California’s Consumer Privacy Act followed, effective January 2020, extending similar rights, transparency, deletion and opt-out of sale, to US consumers for the first time at scale. Both laws made third-party data licensing legally riskier while leaving direct, consented first-party collection comparatively straightforward.
The catalyst: Google’s cookie announcement
The single event that turned first-party data from a good practice into an industry-wide priority was Google’s January 2020 announcement that Chrome would phase out third-party cookies within two years. Chrome commanded the majority of global browser share, so unlike Safari’s more gradual restrictions, this was a deadline the entire ad-supported web had to plan around. Marketing teams that had spent a decade building strategy on third-party cookie-based retargeting suddenly had a countdown clock.
The second catalyst: Apple’s App Tracking Transparency
If Google’s announcement supplied the deadline, Apple’s App Tracking Transparency, which shipped with iOS 14.5 in April 2021, supplied the immediate proof that the disruption was real. Opt-in rates for cross-app tracking came in low across the industry, and advertisers watched mobile retargeting performance degrade within weeks rather than the two years Google’s timeline had implied. It made the abstract 2020 cookie announcement feel concrete.
Where that left businesses by mid-2021
By the middle of 2021, “first-party data strategy” had moved from a slide in a martech conference deck to a standing item on marketing leadership agendas. The businesses in the best position weren’t the ones that reacted fastest to any single announcement. They were the ones that had spent years quietly building direct customer relationships through email, loyalty programs and account-based purchase history, largely because it was good practice, and found themselves with the asset everyone else was scrambling to build.
Why the rise wasn’t about data at all
Strip away the technical framing and first-party data’s rise reflects something simpler: a decade-long erosion of the assumption that businesses could rent access to customers through third-party intermediaries indefinitely. Every regulatory and platform decision from 2017 through 2021 pushed in the same direction, toward direct, consented relationships as the more durable foundation. That’s less a trend than a correction.
