You’re posting an argument from 6 years ago. Not including Steam OS, the Linux market share has almost quadrupled since then (to ~3.2%); including Steam OS, it’s up to ~24%. And continues to trend upwards.

You also don’t need to arbitrarily support Linux. It’s not difficult to say “this has only been tested on Fedora, Ubuntu, POP, and SteamOS; other distributions are unsupported officially”.