Looking in to it a bit more, it looks like they handled this extremely well, admirably even! https://rust.facepunch.com/news/updated-linux-plans
I remember this. I refunded the game ASAP. For the longest time they’ve neglected the Linux client to the point where it was just broken and crashed often and you couldn’t even play with Windows players because the Linux client was so far behind. And of course the Windows version ran just fine on Linux via Proton. Yet they seemed surprised and annoyed whenever Linux players pointed this out. That’s where I lost all my respect for them as a developer. I would refund Gary’s Mod too if I could.