I mean Apple would have to be open eventually right? To attract and retain talent, if everyone else is doing it?

It's like Microsoft under Satya Nadella, really understood that Open Source is a way to actually win developers, rather than Steve Ballmers "Developers! Developers!" chant that was just marketing speak.

So if you want to be in the same league as Deep Mind, MSR, FAIR, Google Research, then you gotta play like them.