The problem is that most of these websites offer no "fuck off" option besides GTFO and usually "agree" is the only button provided and they are probably trackin

The problem is that most of these websites offer no "fuck off" option besides GTFO and usually "agree" is the only button provided and they are probably tracking you from the get go before you even click anything. If you now mandated them to respect some special HTTP header instead, most of them would simply 403 all browsers with this header set and you would have to disable it to access these sites. So same thing as with JavaScript and cookies - either tolerate crap or stop using a dozen websites or install yet another extension for management of per-site exceptions. This law is silly and completely detached from reality. They should either prohibit tracking by law or do nothing.