My opinion is that the target ads is just a cover, the real reason they want to track users is to give more data to their in-house AI system that learns what people do once they reach certain page. This knowledge (what people will do) is what is important to them, rather than simply showing certain ads. For example, if Google knows the profit potential of certain actions, they will raise the ad cost on that property by the true value, instead of relying on non-targeted auctions.
If this was true then every single ad campaign would be worth it then, no? I thought that lots of people try Google or FB ads with a couple thousand dollars and never recoup operating costs. If Google knows how much profit a certain page could bring then they could also tell you exactly what to price your product at to maximize returns.
