That's the point: They don't have to! If you have protocols and software that lets someone run a social OS on their personal hardware and connected to the glob

That's the point: They don't have to! If you have protocols and software that lets someone run a social OS on their personal hardware and connected to the global network, then the walls have been broken. Any 3rd party can integrate or offer hosting. You could also take the rabbit hole of battery improvements leading to running this on mobile devices or sending data through a distributed p2p network instead of personal HW. None of those are orthogonal to the proposal.