If the times claimed by the developers are true, then it just tells me that BSD was the correct choice of license, as otherwise zapcc might not have happened. A world with a lot of high quality software, some of it open source and some of it closed source, is better than that same world minus the closed source.
(I predict that in 10 years all the various soft cores will be variants of RISC-V each with its own old, unmaintained and proprietary fork of LLVM).