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Google makes ads generic: "Google is so dumb it doesn't even know my language"

Google infers your language and other information about you and serves specific ads: "omg Google is so creepy."

If they get too efficient with signals folks are going to push back because ads become too targeted and feels their privacy is at risk.

I personally feel the best solutions are either ad-free services that are paid for either one time or through a subscription.

If something is ad supported, then the way to guarantee privacy is to take a pool of candidate ads from an ad network and rank them locally based on a personal profile stored locally as well and pick the top ad to display. These locally stored personal profiles need to be also synced across personal devices with automatic merge conflict resolution.

As you can see it requires quite a bit of infrastructure that doesn't seem to exist

I don't know, I'd almost prefer that. Gives you an easy signal to ignore.