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When users click "Reject All" on a cookie banner, traditional client-side tracking stops collecting their data entirely. Studies show 40-70% of users reject cookies when presented with a compliant banner offering equally visible accept and reject options. Combined with the 40-60% of users who ghost cookie banners entirely (ignoring them without choosing), you're losing visibility into 80-90% of your website traffic with client-side tracking. The Three User Behaviors Cookie consent banners produce three distinct user groups: Accepters (10-25%): Click "Accept All" and allow full tracking. These users generate complete analytics data and can be retargeted with advertising. In the US, acceptance rates hit 42%, but in privacy-conscious markets like Germany, they drop to 8-12%. Rejecters (40-70%): Click "Reject All" when presented with a visible reject button. Client-side tracking loses these users entirely. Server-side tracking can capture anonymized aggregate conversion events while respecting their privacy choice. Ghosters (40-60%): Ignore the banner...