All the Darwin code is online so why not just check for yourself? A more interesting question is how useful is OSX if we stripped away Darwin? That is, if we

All the Darwin code is online so why not just check for yourself? A more interesting question is how useful is OSX if we stripped away Darwin? That is, if we just left the proprietary bits, like the graphics code. Assuming I don't need Apple's graphics, I'd just as soon use NetBSD than Darwin.