As far as the FSF and Trisquel goes while I don't speak for the project the program obviously violates the Guidelines for Free System Distribution (http://www.gnu.org/distros/free-system-distribution-guidelines.html) by recommending non-free software so it is not included for that reason.
If it is GPL there is nothing wrong with installing it. It would be a sort
of caveat emptor (buyer beware) situation though because of the non-free
software it allows you to install. So if a user cares about freedom they
would have to tread carefully. This is sort of the same as how the GNU.org
website runs on Debian GNU/Linux (http://www.gnu.org/server/) which can
potentially offer non-free software but they are very careful not to install
it so that makes it ok.
- [Trisquel-users] Is Ubuntu Tweak fully a free program? tegskywalker
- Re: [Trisquel-users] Is Ubuntu Tweak fully a free progra... sirgrant
