Nice soapbox rant.
For the record: OS X is based on BSD, not Linux. FreeBSD is like Linux, with quality control.
(OK, that's just a smart-ass remark, but with some truth in it.) Apple has, in fact, contributed a lot of development of open source components; and they are not violating any licenses by using FreeBSD code.
Show me a Linux distro that you can set up a decent DAW on without a she-tonne of tweaking and then we'll talk. And for the record: yes, I have used Linux; compiled kernels & source, configured X by hand, etc...and I'm very glad that Apple has taken care of all that for me, so I can get on with recording.