Yeah, I think it would benefit them to make it open, also. It's really hard for me to think of a protocol that benefits from being proprietary, especially if you're trying to build an ecosystem around it.
(I think there's probably a good case along those lines for an open "Internet of Things" protocol that would let any IoT device work with any voice assistant or other controller -- probably by "publishing" a set of control terms for it, like AppleScript dictionaries and whatever the ARexx equivalent was on the Amiga -- but so far I'm not sure anyone's even proposed that.)
