Interesting people barely have time to pop onto Twitter every now and then, they're not going to bother if it costs money
And I guess we'll see which system ends up bearing fruit, I think we're already seeing the capitalist walled garden model falter, I suspect your more collectivist model won't have the momentum to replace it but while the commons might trip and start with a dozen different stumbles the sheer force of its ever growing ubiquity will carry it through.
Especially as hardware continues to get cheaper and software more efficient, hosting a few thousand users on a federated server is already fairly trivial, its only going to get easier the more hurdles are removed through innovation and tech creep.