It's the dunk tank.
This is where you come to post big-brained hot takes by chuds, libs, or even fellow leftists, and tear them to itty-bitty pieces with precision dunkstrikes.
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There are lots of other 
moments there.
"Single payer economies leads to bad things like Bolshevism and Stalin"
@[email protected] Let's hear your rant
They are seperate because they both have different motivation, tactics, and origins.
Open source could also be used to describe a development methodology (public repo that accepts pull requests/patches with a license that allows redistribution). Free means that the user is entitled to all 4 freedoms (use, study, modify and distribute, or redistribute).
The Free software movement works to create a world of entirely free software. Open source initiative does not make that claim. OSI is more pragmatics (at a cost) while the FSF is more ideologically focused (likewise)
We have this distinction because it matters and that it reduces confusion.
on the other hand, maybe GNU should shove it? viral licensing is a nice hack, but its not like they're the only community that produces free/open source software. many groups share the objective, even if they don't all agree with the utility or importance of viral clauses. obviously, OSI is pretty much only there to make the concept more palatable to corpos, but i don't see any reason to be loyal to GNU.
I think you're being too reductive. Besides the fact that software packages produced by GNU are historically significant (without GNU there is no OSI or even linux), "viral licensing" is a not a good way to describe copyleft (what would you say about Creative Commons then?) and different forms of copyleft exist.
The GNU Project is not just software, it's a philosophy and political stance about people's right to control their computing. The ultimate aim of the project is to produce a Fully free operating system. People are "loyal" (if we accept that wording) to GNU because they believe in the idea of a completely free operating system that only uses free software.
I'm not here to antagonize you, have whatever personal (albeit critical) opinions about GNU or the FSF or whatever group in the FOSS community as you wish (believe me, I have my own hot takes). I just wanted to point out why the GNU Project is significant if not fundamental to the entire Free software ideology and misconceptions about it.
GNU can absolutely go shove it when they keep trying to shove GPLv3 down my throat.