I don't agree with the article that the top couple content creators can walk away and kill a platform. Vine committed suicide for no real reason, it's a pretty poor example to point to. Nowadays on any top social media there's 1-3% of creators making the vast majority of popular content, but more importantly, there's another 15% of people out there who are vying to try and take their spots and will gladly fill the void should the top creators leave. They're mostly just not doing well because the top is being crowded out (and the algorithm keeps it that way), not for lack of trying.