I think you're both right. It's very dilute, but even so it's many orders of magnitude bigger than the counter-examples you give, and even given the dubious con

I think you're both right. It's very dilute, but even so it's many orders of magnitude bigger than the counter-examples you give, and even given the dubious content you have to wade through, the absolute volume of high quality info you can find there is unprecedented. Also it's much lower friction to access (well Wikipedia is about the same, but all the others are gated to varying degrees). So I would contend that YT is uniquely significant as a repository of educational material. That all being said, I agree with your original point - how they moderate/censor that content is and always has been solely YT's prerogative.