Valve should use it’s position on the market for something good and straight up not allow single player games to use external launchers. I’m buying the game on Steam so I just want to play, not make yet another 3rd party account and then pray the 3rd party launcher will work fine on Linux.
I got amazon prime mostly for the free games, it’s pretty much a steal in my country (if you pay for one year it’s about $1 a month) and I still have to pirate things that are available in the prime video. Why? Because I use Linux and amazon won’t allow me to play videos in 1080p. Only 480p is available.