Youtube recommends stupid crap based on what other people like.
If I watch one stupid video not in incognito, ALL of the recommendations become stupid videos because those videos have better metrics. Youtube actively guides me away from educational content.
Even within educational videos, if I click on a click-baity channel once, that channel dominates things I've watched MANY more time. It seems to all be about click-through metrics.
I've never had Youtube recommend really upscale educational content like Zach Star before. It's quality stuff, but you gotta find it yourself.