"primarily", because the LLVM / clang project had its origins in academia (before the project and its team got acqui-hired by Apple), and because the project is

"primarily", because the LLVM / clang project had its origins in academia (before the project and its team got acqui-hired by Apple), and because the project is open source, and thus still gets some amount of community contributions (probably not a huge proportion of the overall effort, though).