Just anecdotally, Youtube's recommendation system seems effectively self-referential. On virtually any subject I look at, recommended videos seem to cycle between just a few themes or even just a few specific videos. I think there's a logical reason for this. I imagine for a given topic you wind-up with: [broad video] related to [other broad but unrelated video] plus [extremist video]. And [extremist video] related t…
I see the same thing on a completely uncontroversial subject: music videos. If I watch e.g. a Beatles video, the recommendations aren't [Rolling Stones, Kinks, Badfinger, ...], they're always [Beatles, Beatles, Beatles, ...]. I don't know if it's naive and bad or if it's actually good for engagement and I'm just an outlier in what I expect to get.
I think what's most frustrating about it is I don't know what game they're playing. Recommendations used to be logical, now they're almost a waste of screen real estate. What even happened?