Right. Non-free operating systems and non-free add-ons are different
issues. I want to encourage people who are using these non-free systems
to add Emacs to them, but I don't want to encourage people using
free systems such as GNU/Linux to backslide by installing ssh.
The readiness of people to add non-free programs to their free
operating systems is the greatest problem we face, and explaining to
people why this is bad is the greatest challenge.