Quality, the same "AI" recommends me irrelevant videos, cant recognise me as a human if i log in from any browser other than chrome, and that issues takedowns randomly for users. The ine that spams, pinterest like shit site quality on front page. Yeah, no, I dont want it to decide.
IIRC Google used to have a dropdown in the search results similar to "Don't show results from this site". Luckily I don't see Yahoo Answers results anymore but would be nice to have Pinterest removed.
If you use Greasemonkey / Tampermonkey, etc. you might want to check out 'Google hit Hider by domain'[0] [in spite of the name, it works on several search engines, not just Google]. It provides a really simple interface to ban [with various levels of extreme prejudice] sites from ever again appearing in your search results.