I don't object to seeing adverts, I do object to having all my personal data hoovered up by ad-brokers.
Or just let people select their own interests. There's quite a few (particularly news / media) sites I'd be fine in disabling an ad-blocker on if the ads I was served were in any way useful to me rather than bottom-of-the-barrel "one weird trick"s
I imagine a distributed machine learning algorithm could probe floc with random categories, and hill climb using the results of auctions.
That wouldn't improve privacy over simply not supporting the protocol at all.
By this I mean, check if protocol returns something, else, “this site only works on chrome”.
This would effectively force, Firefox at least, to implement this protocol.
A version of this protocol with randomly generated data might be better for the user.