Microsoft has already been there before as well, they are adopting SPIR-V only to cut down their fork, and because Google already did part of the work for them.

Apple apparently got very pissed on how Khronos took care of OpenCL.

Then Sony and Nintendo couldn't care less about Khronos, people keep forgetting about game consoles when discussing the portability of Khronos APIs, or ignoring the fact that in reality they aren't really that portable due to the extension spaghetti.