Clean it of trash and you will receive less trash recommendations. Fully cleaning isn't effective as the average video quality is lower than most HN public would like to watch. Having mostly good videos you like makes it recommend more similar content to you.
It's not just average video quality, it's that (as far as anyone can tell), the algorithm optimizes for expected value of total watch time, as opposed to optimizing for just the likelihood of watching the next video. Basically, the recommendations behave as though they "hope" that you will go down a conspiracy or outrage rabbit hole and binge 12 hours of garbage.
For me it correctly "hopes" I'll go down science rabbit holes, which I do. I'm similar to the person above, I watch a lot of educational content, and I also get suggested great content.
Right now I see the follow up to the guy who build his own VGA card, video of someone building a camera that can see wifi, and a PBS video on the "quantum internet". All great suggestions.
