I always had to walk through a minefield of right wing crap on YouTube, but I recently started watching some videos on gender transition and YouTube almost immediately started showing me anti trans crap and videos about "detransitioners" and whatnot. My god, it's so fucking infuriating.
Also, I don't know if that's possible for video recommendations, but for ads, you can click on de three dots and see why they were recommended to me, and it's always shit like "your age and AGAB and what other people where you live are interested at"... I know Google is paid to just show ads based on those kinds of flags to the people that have them in their account, but my brother in christ, I couldn't give less of a crap to what other people of my age and AGAB are interested in where I live.
Oh, I know that Facebook also flag their users with their political alignment and let advertisers target that. I would not be surprised if Google does that too.