They already did, UWP support for Window 10 IoT is older than Brillo/Android Things.

I hope it is something cool. They have shown a remarkable willingness to contribute "something" to just about "everything" in recent memory. A lot of has been open to boot!

I do not want to let you down, however, and will provide an equally inflammatory remark: We do know that Apple will continue to build walls around Homekit making it virtually useless to anyone outside the already fortified walls of iOS!

MUST - nice acronym