I think I can understand your point. Large ‘“media” companies will horde the content and refuse to let it see the light of day because they believe they own it. I don’t think that’s how it would go down. Anything I’ve ever produced to be put on the web still exists somewhere on a hard drive that I control. I doubt the big name educational YouTubers are deleting the source material as soon as it goes up to YouTube.
Besides, a lot of the good ones have already moved to Nebula as well. If thought like educational YouTube you should check it out.