Earlier quoted context omitted.
Your first mistake was thinking that you are the user they care about serving :p
YouTube premium never shows me adds, and downvotes have reliably gotten the AI to stop suggesting a musician or autoplaying a song that I don't like, regardless of their rough membership in a genre I otherwise want to hear. It makes me feel guilty to downvote someone or their work who's probably a good person, but it's the only reliable way to tune the AI. I get a lot of enjoyment out of music on youtube premium, but…
The YouTube community usually doesn't take downvotes as "not interested", but rather as an explicit expression of "this is crap".