What are you talking about? Apple has released the source of every version of the core OS X stack from 10.0 to 10.9.0 (including 10.4.9):
You can even recompile your kernel and swap in your replacement. Occasionally they take a little time to post it (I don't see 10.9's point releases up yet), but it gets there.
Why anyone holds these people up as innovators of industry is beyond me, they did not invent
Invent != Innovate. I'm glad that you can admit that you don't understand the industry, though. Admitting ignorance is the first step in learning.