Replying to @null and @therevoltingx, @johnnyryan, @BrendanEich, @samtingleff, @acfou, @kickstand, @mrr619, @WolfieChristl, @johnwilander, @brave, @random_walker
There is no problem, except that only a small percentage of users will consent if it's done according to guidelines. I think the highest I heard of in testing legal dialogs was 14%, most were half that.
So if your ad strategy hinges on gaining legally valid consent, following official guidelines, to what is done in RTB today then it's just dead on arrival.