"Despite appearances, the site is not actually sponsored by Apple - people just seem to like using their tools. We're a fan, too."
However, I wouldn't be surprised if there was some selection bias involved. On the other hand, they sometimes feature such hardcore geeks like Russ Cox running Plan9 from User Space[1].
The stack is pretty interesting and impressive, almost everything they use are things I would choose to use under similar constraints and would love working with.