Advertisers won't be the only ones with stake. All the whales invested in the platform will be ready to downvote advertisers who don't contribute enough value.

Advertisers will just have to adapt by a) doing the kind of advertising that is actually appreciated and valued by users and b) compensating users monetarily for their attention. It seems like the perfect platform for that as you can find out what users like from their public posting behaviour and sending them a small financial reward in the form of SBD is trivial.