> What works is content based advertising - so advertise a power drill on a woodworking hobbyist site. No tracking required there. Conversion can be obtained when user clicks a link via redirect. Like in the good ol times.

This still requires tracking to follow the user through the whole flow, which is required unless you want to be defrauded with fake users at the very least, but also very important to track the actual performance of each ad source.

Why do things that are important to the advertiser trump what's important to the user? I don't care how hard it is for you to track the performance of your ad sources, I just want you to stop tracking me.