And they find that because twitch is one of the biggest sites on the internet and has okay-good discoverability. And even then, it is generally weeks (if not months) of effort to get to the O(10) concurrents, let alone O(100) where it starts being profitable on time alone… let alone hosting.
Versus some random website on a meme domain that nobody will ever find.
Its the same with peertube and the like: The use case for individuals is near zero and it mostly exists as something to fuel sites like Nebula or floatplane that are trying to build their own services.