Well it's because vendor lock in. Vendor X dont want you to access his messaging app from another client V, and instead of using P2P , Vendor Y uses a centraliz

Well it's because vendor lock in. Vendor X dont want you to access his messaging app from another client V, and instead of using P2P , Vendor Y uses a centralized server, with the a protocol not supported by any other vendor. But vendor U swears he supports open techs !!!