I think it's probably pushing pattern it sees in other users. There's videos I'll watch multiple times, music videos are the obvious kind, but for some others

I think it's probably pushing pattern it sees in other users. There's videos I'll watch multiple times, music videos are the obvious kind, but for some others I'm just not watching/understanding it the first time and will go back and rewatch later. But I guess youtube has no way to understand which one I'll rewatch and which other I don't want to see ever again, and if my behavior is used as training data for the other users like you, they're probably screwed.