With my YouTube account, I've had this problem for many years where the autoplay gets "stuck" on a particular channel, and this can last several months. Back around 2018 it got stuck only recommending Jordan Peterson videos. I'm not a Jordan Peterson fanboy, but I did watch a few of his videos and as a result YouTube believed that I only wanted to watch JP and nothing else. Nearly the entire list of videos on the right-hand side above at least the first few folds were nothing but JP. I would mark some of the videos as "not interested", but I hesitated because it's not like I didn't want to never see the videos. Eventually it magically got unstuck, and things would be fine for a while until it got stuck on something else. Last year it got stuck on Lex Fridman for several months. I could be watching a video on video gameplay and then it would suddenly move on to a Lex Fridman episode I'd already seen.
Maybe they're both corrupt and just not that sophisticated. All I know is that its recommendation engine is faulty and they refuse to show me the latest content from all of my subscriptions.