I don't really care who sets it up, but since everyone that is currently on facebook chat (be it Messenger or WhatsApp) is also a customer of some mobile carrier, having the carriers create an alternative is not a completely ridiculous idea when we want to make the chat infrastructure distributed/federated. I'd be happy to MMS my uncle if it didn't cost like two euros per 640x480 picture; RCS seems to be the way I'll be able to do that without going through Facebook.