They can only sell the ads they've got in inventory. I've been on FB since 2006 and the last ads I remember seeing were for godawful Farmville-style games and shady dating sites. My profile would tell them I'm college-educated and living in a developed country with a network of similarly educated friends. And yet, I have never seen a single ad that didn't look like it would have fit right in at a late night infomercial.

The Twitter PWA Chrome app sadly doesn't block Promoted Tweets, and it's the same thing there; low-quality ads from garbage companies I'd never consider buying from.