Advertisers are going to use it as just another data point, though. Why give them any more information than they already have? You know some of the best technical people we have waste their lives working for advertisers, and they _will_ find a way to extract more information from these technologies regardless of how supposedly private they are.

I don't think there can be a technical solution to this problem unless advertisers are forced by government regulations to behave, with very heavy fines for non-compliance.

I personally really hoped for Mozilla to take a strong stance against advertisers and introduce an aggressive ad blocker, but it was pretty obvious they're not going to do anything like that because of the conflict of interest (Google's money). Now we get another conflict of interest on top that makes it even less likely.