My experience with their algorithm between 2014 and ~2020 was that autoplay would quickly turn into a form of video diarrhea composed largely of Jordan Peterson and Lex Fridman. Was pretty bizarre because I only watched a few Peterson videos in the beginning, mostly his "Maps Of Meaning" videos which I think are mostly poppycock, and ever since then YouTube would quickly bring me back to his content even though I was never navigating to it organically. I had to resort to clicking "Not interested" and "Don't recommend channel" on several videos, which sort of worked, but it wasn't fool proof.
These days it happens way less often, though usually that loop contains a lot of "gurus" in general and less of Peterson.
I hope I never have to hear the voices of Jordan Peterson or Lex Fridman again. I'm not a fan of either one, but YouTube insisted I was for many years.