No, Carmack isn't a fan of Linux as a gaming system. Look it up. Which is to say, on the consumer end. idtech was coded in NEXTStep workstations until at most q

No, Carmack isn't a fan of Linux as a gaming system. Look it up. Which is to say, on the consumer end. idtech was coded in NEXTStep workstations until at most quake 3, so he liked Unix for development. IIRC, the linux ports of idtech were done by Dave Taylor, not Carmack. Carmack basically just gave a shrug and signed off on them, because they worked, so why not? And RMS's hell is one where everyone uses open source to some extent, calls it open source, and has no philosophical reason for using it, only practical ones, and have no qualms about mixing it with closed source software.