OTOH there are open source products which exist that are validly assigned a brand name. Phoronix OpenBenchmarking.org? Sure. Oracle VirtualBox? Sure. GNU GCC? Yep. Nokia/Digia Qt? Yeah. But it's actually a point to Apple's credit that they don't smear their branding or proprietary licenses all over LLVM. It's basically as neutral a project as anything at freedesktop.org. It isn't commercialized; it isn't packaged and sold under a proprietary / commercial support license; it's just "pure tech".
Besides, LLVM has enough interesting applications in graphics drivers and such that there are way more companies with a big stake in LLVM than just Apple. Even AMD is starting to get a piece of the pie, and sooner or later their LLVM backend will make it into some sort of upstream repository.