People willing to play expert modpacks are also people who are willing to tinker with Arch Linux.

Seriously though, there's so many parallels between modded Minecraft and Linux: they're foss, they have a billion packages with a billion dependencies, weird bugs pop up and you work around them, and of course, the skill set to automate things in a game like that (or factorio, satisfactory, etc) lend themselves to using console commands and scripts and such.

That said, it's also just easier to play Minecraft on Linux with a launcher, haha.