Because of the network effect, he'd have to spend billions to get enough infrastructure for his streaming service to be able to compete with YouTube and Twitch. Because people go where the content is, so a majority of content creators would have to start using it, rather than just himself.
Until that, it's like Epic Games Store. They keep giving away free games and STILL nobody wants to go there because all their games are already on Steam. Doesn't help that their launcher is shit too, but even if it wasn't, most people wouldn't move over.