As a counterpoint, Apple likes LLVM. They've modified it, and they're selling their proprietary fork as XCode. They've found great value in the freedom afforded them by the BSD license. The users of XCode, however, aren't seeing much benefit from the BSD license, because it never got to them. Apple ate it along the way.
As a correction to the counterpoint: Apple has paid for full time development of Clang + LLVM, as they use it. Despite being under no legal obligation to share the source back to the community they have done so; in essence donating their time and money to a BSD project. Their users benefit (by having a better compiler), and other Free software users benefit (by having a better compiler, plus the ability to build their own IDE around the same underying compiler tech. as Xcode).
There are plenty of examples of BSD software getting "eaten" by a proprietary stack, but much of Apple's usage is actually one of the worse examples you could provide, as they often do contribute quite a lot back.