I don't get this view.

Yes there is a lot of crap because it's both easier to produce than quality content, and has higher incentives to keep making more of it.

But that's the same with eg. books. Aside from small curated book stores, pick up a random book. Most likely it's not worth to cut down the tree it was printed on.

It's very easy to watch only quality content and there is an incredible amount of it on youtube. I've learned lots of electronics, CAD work, mechanical engineering, watched tons of lectures from amazing professors...