Most teams still treat user opt-outs as a workflow problem. They are actually a stream-processing problem. When a browser sends the Sec-GPC: 1 header (or sets the navigator.globalPrivacyControl property to true ), your site has milliseconds to decide what tags fire, what cookies drop, and what data leaves your domain. Doing that by ticket is no longer realistic. The technical shift Modern consent stacks read GPC the moment a request hits your edge. The decision tree is small: if ( navigator . globalPrivacyControl === true ) { setOptOutCookie (); blockDataSale (); logSignal ({ ts : Date . now (), source : ' gpc ' , action : ' opt_out ' }); } Enter fullscreen mode Exit fullscreen mode A real CMP wraps that in a server-side tag manager, audit logger, and per-jurisdiction rule engine. The result: every signal is honoured, logged, and provable to a regulator without engineering time. Why it pays off The business case is simple. California, Colorado, and Connecticut already treat GPC as a valid opt-out.…