> I feel like people would love to throw off the shackles of YouTube and Twitch, but are probably less enthused about not having their channel advertised to the platform's users. Things like maintaining your own Stripe account also sucks.

I get the impression that's basically it. You've got to go where the audience is. Even Hololive who are big enough to have their own platform haven't attempted to do this. Bureaucracy aside, youtube is also pretty reliable at global scale.