Maybe the right way in terms of privacy, but I find it all to be rather monopolistic. (Brave’s ad replacement is infamous in this respect; they trashed it but blocking publisher ads and creating their own is pretty similar to their initial proposal).

I’m also not totally sold on differential privacy because, as far as I know, it’s still relatively experimental and not very battle-tested. I remember Mozilla saying something to the effect of anonynization only working if a large pool of users commit to their tests.