He helped found the FOSS movement, and contributed to a lot of code over the years, but a lot of the GNU aspects of Linux, like Gnome, KDE, Pulseaudio, etc. etc., were all created by other people.
This is going to sound snarky but I’m genuinely trying to understand: you’re ok using software distributed under a license that Stallman (and others) wrote, but don’t want to use an operating system written and maintained by a completely different group of people because it contains some code he (and others) also wrote? In your eyes, what’s the difference? Will you stop using software compiled by GCC? It just doesn’t fully track for me.
So I guess you’ll be abandoning Blender, too, then, since it uses the GPL license.