@paoloredaelli The choice of a weak license by the BSD's is about the power of the proprietary software developers to take the users freedom.

The BSD 3-clause and the GPLv2-or-later, GPLv2-only & GPLv3-or-later are compatible licenses, but the BSD's avoid including software under strong licenses as much as possible, as that means a proprietary software developer not being able to take the users freedom with that part.

The kernel, Linux has the same problem as the BSD's - it contains proprietary software without source code and therefore it is proprietary software.

>By the way I just don't need to try #GnuLinux as I have been using it **exclusively** since 1997 (yes, twenty nine years).
Linux became proprietary software again in 1996 - you indeed need to try out GNU Linux-libre, for your freedom's sake.