To a certain extent that’s just impossible since the degrees you’d have to go to for enforcement would inevitably lead to someone genuinely talking about a product they prefer getting penalized. Think of the episode of south park where the one girl turns out to be a living advert.

There has to be serious limitation on bandwidth usage. First to ban targeted advertisement, second to make national, state level, and local adverts all get equal air time, and third to cut the amount of broadcast time that can be used for advertisement and page space that can have advertisements.