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I'm a Stallman fan, but I also consider him a dogmatic partisan. He doesn't endorse "open source": https://www.gnu.org/philosophy/open-source-misses-the-point.html
"As the advocates of open source draw new users into our community, we free software activists must shoulder the task of bringing the issue of freedom to their attention. We have to say, “It's free software and it gives you freedom!”—more and louder than ever. Every time you say “free software” rather than “open source,” you help our cause."
He also doesn't, in general, use a web browser: https://stallman.org/stallman-computing.html
He charts the limits of Free Software philosophy, but that is very different than making it mainstream and accessible.
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Agreed, this naming could be polarizing