What two forces — regulation and browsers — are killing the third-party cookie, and what is the business impact?

GDPR requires explicit consent (fines up to 4% of annual revenue) and browsers (Safari ITP, Firefox/Edge by default, Chrome) systematically block third-party cookies, cutting personalized-ad revenue by 20–60%.

* The converging pressures killing the third-party cookie and the revenue fallout. *

Two converging pressures:

• GDPR compliance — explicit consent required; only technically necessary cookies are exempt; fines up to 4% of global annual revenue
• Browser blocking — Safari's ITP blocks systematically; Firefox/Edge block trackers by default; Chrome planned full phase-out (announced for end of 2024)

Industry fallout:

• Personalized-ad revenue drops of 20–60%
• A pivot toward server-side tracking and first-party data strategies

Tip: This is the central narrative of modern web tracking — the third-party cookie is dying, and the whole ad-tech industry is scrambling for replacements (CHIPS, Topics API, CNAME cloaking, server-side tracking, fingerprinting).

Go deeper:

• Privacy Sandbox (Wikipedia) — the browser-side phase-out and its later scaling-back.