Privacy Sandbox Is Dead, Cookies Survived — Why Fingerprinting Won Anyway

For six years the ad industry braced for Google to kill third-party cookies in Chrome. It never happened. In April 2025 Google formally abandoned deprecation, and on October 17, 2025 it shut down most of the Privacy Sandbox APIs it had spent those years building as replacements. Heading into 2026, the “cookieless future” as it was sold — Chrome-led, Sandbox-backed — is officially cancelled. So why does it matter to anyone running accounts? Because the thing that actually replaced cookies isn’t an API. It’s fingerprinting.

What’s true in 2026. Third-party cookies still work in Chrome by default, though a growing share of users have opted into stricter privacy settings, eroding their reliability. Meanwhile Safari, Firefox, and Brave have blocked third-party cookies for years — roughly a fifth of global traffic is cookieless regardless of what Chrome does. Google’s surviving privacy pieces (CHIPS, FedCM, Private State Tokens) cover narrow cases and don’t restore cross-site tracking.

Why fingerprinting won. With no single cookie replacement and inconsistent cookie support across browsers, platforms and anti-fraud systems lean on the one signal that works everywhere and survives incognito, cleared cookies, and IP changes: the device fingerprint — canvas, WebGL, audio, fonts, and dozens more parameters combined into a near-unique ID. That’s precisely the identifier platforms use to link your accounts, and precisely what an antidetect browser is built to control.

Why this matters for account operators. The takeaway cuts through a common misconception. “Cookies are dead, so tracking is weaker” is wrong on both counts — cookies survived in Chrome, and tracking got harder to escape, not easier, because fingerprinting doesn’t care about cookie settings. Switching IPs or clearing cookies does nothing against it. See what an antidetect browser is for how fingerprinting works and why it’s the layer that matters.

Bottom line. Privacy Sandbox is gone and cookies live on — but the practical winner of the whole saga is device fingerprinting. For anyone managing multiple accounts, that makes a proper antidetect setup more essential in 2026, not less.