Well, obviously what RMS did with TeX was 3) declare that a project that
requires you to change its name and the name of all its font files and all
the references to such files within all documents, or requires you to add
an elaborate mapping mechanism to allow such changes without impact (which
was eventually done) *is* nonetheless free.
The TeX license is sufficiently far from free that special clauses had to
be inserted into the DFSG and other such definitions specifically to
grandfather it in.