Mostly I was looking for a specific/practical current example where using LLVM allowed a company to release something closed-source, where they would have been forced to open it if they used GCC.
The rubber apparently meets the road with the NVidia shader compiler.
I'd also like to note LLVM/clang didn't gain large non-apple marketshare until GCC adopted GPLv3 which has more to with it's stagnation than anything IMO. v2 is palatable to many business needs, v3 is not.