Hah I had to look some of that up. I bet I could guess your age within a couple years. :)
DCS seems like a cash grab and travkir thing seems quite the gimmick. But i understand you wanting to play with your friends and so do they and they aren’t going to bring Linux support despite it’s likely built on it.
Windows is essentially free anyway these days so you’ll just have to suck it up for now. You can disable things like realtime scanning for a performance boost. If you can’t make your own DNS try quadr9 to block a majority of the telemetry and shit.
Being able to play with your friends is more important really. Just dual boot or use a VM to get your nix skills. I’m sure many won’t agree with me and that’s cool. There is nothing Linux can’t do, yet there are apps (or games) that will simply require windows to participate. Sucks, but that’s reality.