

I’m on Mint and have been for 2-3 years now and I’ve never had any problems with non-valve multiplayer. I don’t use any VMs and just run everything through proton and have never struggled.
Battlebit, Helldivers, Lethal Company (+mods), Risk of Rain 2, Rocket League, Minecraft, and Split Fiction to name a few. I guarantee there are others I’ve played, but I can’t remember.
I played the whole game through with multiplayer between me and my partner. It might be better now, but at the time, all of the danger squids were completely inert, so it made it much easier to get deeper and progress further without fear.
Otherwise, it was a total blast and a great time. Excellent game.