I’m going to argue that YouTube is a lot like Wikipedia.

Sure, it has ads. The business models are different. There may be less moderation and thus more garbage. But it’s mostly volunteer work. And it’s got a massive amount of knowledge, from arcane facts to highly practical educational content. The good channels provide a table of contents, links and cite their sources in the description. It’s a community effort, which has spawned communities of its own. It’s also been relatively stable in being that way for 20 years, which is remarkable.