Comment by Barrin92

>Somebody needs to figure out how to move millions of people from one platform to other

it's been solved, ban the platform. This is a collective action problem. Even if every single user on platform X wants to move to platform Y, as long as they can't coordinate the movement individual cost exceeds the benefit they'd all get.

So the most straight forward way is to get rid of the platform , and everyone will move out of necessity.