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free ruleware
(lemmy.blahaj.zone)
alt text: Someone looking disinterested at their fingernails. "Me pretending that i dont care about convenience so i can use free software"
It's probably a mix of that and how CAD/Engineering software is a complicated niche market. It's not as ubiquitous as something like an office suite or even a phot editor like GIMP. I don't have anything to back that up other than a hunch.