Because they sell hardware and commodize its complement. Having a good Dev experience is part of that, be that a good story for mac-only software (swift/xcode -

Because they sell hardware and commodize its complement. Having a good Dev experience is part of that, be that a good story for mac-only software (swift/xcode -- ymmv if this is better than other technologies, but that's the intent) or having your posix software mostly just work.