I'm going through the process of copyright assignment to the FSF. It's a little tedious but I want to hack on core!
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Apparently the WTF license is used in software packaged by all major distros, and the FSF considers it valid!
glibc and gnulib are looking at removing the requirement for FSF copyright assignment, following gcc:
GCC will no longer require copyright assignment to the FSF! https://lwn.net/Articles/857791/
It's definitely a hurdle (I've done the paperwork in several jobs) so this should really help new/casual contributors.

