Basically title. Do you know of any companies that use desktop Linux?
I can think of two in my area in Brisbane - Adfinis and Red Hat. Both have a pretty small presence here from what I last heard (several employees each).
My employer allows the Linux team to use Linux but it’s discouraged and our lives are made somewhat difficult.
Lots of arcade games and other amusement machines made in the last twenty years run on desktop Linux.
Incredible Technologies games, Raw Thrills/Play Mechanix Big Buck Hunter Pro, Arachnid dartboards, and TouchTunes jukeboxes off the top of my head.
Oddly, most Japanese arcade games are running on Windows, for ease of portability in their market, which makes PC ports actually extremely straightforward.
Source: I got to use machines when they were doing a reboot and the whole interface loads up for the multi-game cabinets like a emulator frontend that just launches and kills the processes.