I would say that the license is to a certain degree also a technical reason to use LLVM. Projects, corporations or people can integrate LLVM into their product

I would say that the license is to a certain degree also a technical reason to use LLVM. Projects, corporations or people can integrate LLVM into their product with less hassle than with GCC. You can't integrate GCC into a product directly, GCC can only be used as an independent binary. I would think that this would make LLVM more enticing to developers. Obviously this depends on the intended use if all you need is a compiler GCC might still be the better choice.