Apple uses LLVM to drive the very sophisticated auto-completion, static analysis, and error reporting features built into XCode, which are by any standard insanely good. No need to get politics or hidden agenda conspiracy theories along for the ride.

Also, I think you should invest a little time finding out what LLVM is used for besides as the backend for the compiler Apple uses. Apple maybe the only heavyweight driving the development of Clang/LLVM, but it is definitely not the only one using or profiting from it.