Theo de Raadt: https://news.ycombinator.com/item?id=12617881
These objections have been largely glossed over by the LLVM community. It's no secret that a handful of corporations are pushing for this change, and not the best interest of the open source community. Especially the larger ones using LLVM, like *BSD. LLVM is already under a permissive BSD-like license (NCSA), as pointed out by jwilk: https://news.ycombinator.com/item?id=18700258
OpenSSL is similarly attempting the same thing with newer versions of OpenSSL, which they went about in a particularly legally dubious way: https://lwn.net/Articles/717996/ (For context, OpenBSD maintains LibreSSL).