Ain’t nothin’ gonna change
You can go away
I’m just gonna stay here and always be the same
Ain’t nothin’ gonna change
Never thought I’d quote Fred Durst but it went something like that when the nookie went down…
Google has been “killing” third-party cookies since 2020. It is now 2026 and they’re still alive, technically. Sort of.
For anyone working in AdTech or data, this has been one of the more exhausting sagas to follow. Not because it’s complicated — it’s actually pretty simple. It’s exhausting in the way that watching someone (i’ll keep this anonymous for now) try to parallel park for eleven minutes is exhausting.
A Brief History of Nu-Metal a Slow-Motion Disaster
Here’s the timeline of Google’s cookie drama, condensed:
- 2020: Google announces they’re phasing out third-party cookies in Chrome by 2022. Privacy! The future! Everyone scrambles.
- 2022: Delayed. “More time needed.”
- 2023: Delayed again. Privacy Sandbox still cooking. All data/adtech/martech conference keynotes talking about it.
- 2024: “Actually, we’re keeping cookies but making them opt-in.” Plot twist. More talk.
- 2025: Default opt-out system rolls out. A prompt appears asking users if they’d like to enable third-party cookies. Nobody clicks yes.
So technically, third-party cookies still exist.
What “Default Opt-Out” Actually Means for Your Data
If only 5–15% of Chrome users actually opt in to third-party cookies — which is optimistic — you’ve just lost tracking and targeting capability across 80–95% of the world’s most popular browser.
That hits you in a few very specific and painful ways:
- Retargeting basically falls apart. You showed someone your product three times, they were close to converting, and now you can’t follow up because you can’t identify them across sites.
- Attribution becomes a guessing game. Was it the display ad? The search? The email? With fragmented signals, your attribution model is now less “data-driven” and more “vibes-driven.” ( cue the vendor solutions promising full blown attribution, “just give us your data”)
- Audience targeting gets harder because you can no longer build audiences from behavioral signals collected across the web. All that third-party intent data you were buying? Increasingly worthless.
- Frequency capping goes out the window. That same user sees your ad 47 times in a week because you have no way to know it’s the same person across sessions. Annoying for them. Wasted budget for you.
The Uncomfortable Truth
Third-party cookies were always a hack. A workaround that gave advertisers enormous power they probably weren’t supposed to have.
The idea that an ad tech company could silently track your behavior across thousands of websites — without you really knowing, definitely without you consenting in any meaningful way — was always a bit wild. The industry knew this reckoning was coming. GDPR in 2018 was the first loud signal. CCPA followed. Apple’s App Tracking Transparency in 2021 was the canary going very quiet in the coal mine.
Google just took five years to acknowledge what Safari had already done.
First-Party Data Is Having Its Moment (Finally)
If you’re a data engineer or on a data team right now, this is actually where things get interesting.
Companies that invested in loyalty programs, registration flows, and direct customer relationships over the last few years? They”re largely fine’re the ones with a moat.. They have first-party data — email addresses, purchase history, browsing behavior on their own properties, all with proper consent. That data is portable, durable, and fully complies with customer consent.
Companies that built their entire targeting strategy on renting third-party audiences and cookie-based retargeting are scrambling and spending a lot of money buying tools with names like “identity resolution” and “cookieless targeting”.
The practical shift for data teams is building the infrastructure to actually activate first-party data: CDPs, clean rooms, on-site event tracking that you own. Less dependency on opaque third-party signals, more investment in the data you actually have a relationship with.
A lesson learnt
The cookie won’t be completely dead for a while. But it’s in that zombie phase — technically functional, largely useless, still showing up where it’s not wanted.
The advertisers who’ll come out ahead are the ones who stopped waiting for Google to make a final decision and just started building for a world where they own their data.
Let’s continue building.
