Open-sourcing it only matters if the third parties can actually talk to Apple customers using Apple's FaceTime. If third parties can't use Apple's relay servers

Open-sourcing it only matters if the third parties can actually talk to Apple customers using Apple's FaceTime. If third parties can't use Apple's relay servers then they can't talk to Apple customers using Apple FaceTime. If all you're interested in is having some protocol to use for video chatting and don't care about talking to Apple customers, then what's the reason for trying to use FaceTime's protocol? I didn't think they were really doing anything particularly special on the protocol side.