I wish more people would realize the root cause of all this spying is advertising. Simply banning advertising would get rid of all this shit more effectively and with less overreach and compliance headaches than the GDPR.
In my experience most people actually don't, and any anti-advertising strategy has to come to grips with this fact. For example I really can't stand radio ads so when I'm in the car with somebody and the radio starts playing ads I will ask if they can turn it off. Usually they will be pretty surprised, ask "why" etc. I think many people are genuinely able to "tune it out" and not be annoyed by ads.
It's not perfect but I think this definition would include e.g. billboards, newspaper ads and most internet ads, while excluding non-advertising integrations of third-party data (e.g. when a navigation company buys maps from a mapping company to show to their client, it does not fall under this definition because money flows the other way).
Advertising is a core activity of capitalism, which our western governments protect and further at all costs. Until we leave capitalism as a system behind, advertising will keep growing.