It's an old saying, basically observing that some things become niche and some don't.
Old style forums are a classic example. I wouldn't post about my garden on a ham radio forum.
But if a video hosting site wants to appeal to the masers it has to have a diverse spread of content. Which you've observed about flare and fountain and their bitcoin centric recommendations.
However fountain is improving, I follow permaculture, bitcoin and philosophy channels over there. So it's changing 👍🏻