I think "killing a platform" is less interesting than "birthing a competitor". And the Mixer experiment of 2021 suggests that the top dozen creators 5 years ago still wasn't enough to even foster a new platform. Market capture at this scale is truly sticky.

As another example. We're some 8 years into the "streaming wars", with a lot of top content leveraging their IP's. Netflix still seems to be long, and the only one profitable (though I wager it is not profitable on sustainable measures). Disney, HBO, paramount, and many more have struggled despite weilding much more well known programming. Being early is just so important in these situations.