[kiallmacinnes]

I don't have any data to back this up, however, I suspect that standard protocols leaving little room for vendor lock in is the primary driver behind the closed systems we're seeing today rather than some inherent limitations open protocols.

(I'm not saying the current open protocols are perfect, or even close, however - 100s of closed chat protocols have been built and rebuilt - that effort would have been better spent in the open IMO. Obviously, investors and similar business functions see things differently though.)