What if they get ads right? Not low rate garbage, but hyper targeted ads that are actually useful.

I might be grouchy, but I don't want any ads to be useful. A useful ad is just a successful ad. The endgame of the most successful persuasive ad is mind control. If some ad genuinely convinces me to buy a thing, while I may really be glad I bought that thing, I still have this feeling of being used and would prefer it didn't happen.

(when I've seen a useful ad for something I really want, I've often been able to find nearly the same thing from someone else for less. They can afford to charge less since they're not paying for ads)

are they going to turn down money from borderline scammers peddling cheap chinese products with bogus claims? if not, then they can only show so many high quality ads before they start showing the same garbage Facebook does.