Tech CEOs coming from Twitter are like "There's no way a federated system can scale! Look at this thing, it runs on Rails!"

And there are so many loaded assumptions in that statement, between how this thing is supposed to work and what the capacities and limits of the underlying technologies are. Like, I seriously doubt your expertise on any of those subjects?

Anyway, it's not like every single instance has to replicate all content made by millions of accounts, or that the majority of traffic has to be concentrated in any one place. There will be challenges, but the nature of the beast is not the same as a corporate social network.