I was explaining this to my daughter not long ago when she told me she kept getting recommended videos about something that offended her (I can’t remember what, but something Republicans would be in favor of) on YouTube that the algorithm doesn’t care whether or not you agree with the videos. It only cares about whether or not you’ll watch them. And if you’re willing to hate-watch, which many people are, you’ll get served the same videos as the people who enjoy it.
And, of course, the more controversial the better because you’ll get a whole lot of both groups. So if you post something sexist and hateful, you’ll get a huge number of redpill viewers and the like and then all the other people who go to that post to argue with them. Which means the algorithm learns that those are the best things to push on new accounts too.