Comment by sparky_

This is interesting from the external perspective, but let me provide the internal one: Employees are prohibited from so much as _thinking_ open source for anything not directly managed or maintained by Apple. Swift is one thing, but suppose on your own time, you had OSS interests. It was made abundantly clear to we lowly SWEs that _any_ perceived OSS participation - so much as commenting on a GitHub issue - without approval would be cause for immediate termination. Said approval requires the unanimous approval of multiple SVPs, including Federighi and Schiller themselves. IIRC the number of Apple employees given such arrangements was in the low 50s last I checked.