If there was a billion dollar company to build on this premise, someone would have. In practice, users don't care about having to install five different messengers and not using their own clients.
Do you suggest that all billion dollar companies have been already founded and there's nothing new which can be done? I find such way of thinking harmful.
No, I suggest that all billion dollar messaging companies that don't lock their users in have already been founded. I would love nothing more than to be proven wrong.
