To some extent, it does own it. Ever tried to push even a mildly controversial patch to LLVM or Clang upstream? If Apple guys are against it, it's a full stop,

To some extent, it does own it. Ever tried to push even a mildly controversial patch to LLVM or Clang upstream? If Apple guys are against it, it's a full stop, no matter how many other parties are interested. And their reasons to be against a particular patch are often as simple as that it'll break compatibility with their internal, unpublished changes to LLVM. Learned it the hard way...