Problem is still not solved because search also returns a lot of garbage, and you don't want kids to be on a site that's 99% garbage. Xvideos could have a large library of science and history videos while still being 99% porn. Like I said, adults should download and curate the good stuff but recognize they're still in the seedy part of town, shouldn't let kids go there, and shouldn't expect it to be a platform for learning. That's just not its purpose. In fact youtube's purpose is basically the opposite of personal growth.
You can get literal pbs at pbs.org for $5/month, or your local library for free.
YouTube has too much information to just ignore for education. It's the most efficient method of learning for many topics and for many people.
It's closer to PBS than a porn site imo. (The idea of a porn site with YouTube's puritan guidelines sounds pretty funny.)