While it sucks that Gmail dominates e-mail, it is still important and useful that they don't control all of it and that essentially everyone continues to intero

While it sucks that Gmail dominates e-mail, it is still important and useful that they don't control all of it and that essentially everyone continues to interoperate with the protocol enough that I can still run my own server even if most people don't. You don't have to have a fully distributed protocol with no large players to gain powerful benefits from decentralization.