From Hardlimit
I don’t know why valve does that. I consider myself a pretty informed consumer, and I was under the impression (I believe rightfully so!) that if the Linux logo is not featured, then the game can’t play on any Linux distro more or less.
Could be some legality issue where a game they cannot Mark a game which is not linux native with the linux logo
I think it is a simpler case of legacy. They had the Linux/Windows/Mac symbols before proton was a thing and back then you needed it to be a native Linux game for it to work on Linux. Or you had to install all of steam inside wine and had pot luck as to if anything would work. Since they released proton they have kept the OS symbols the same. And since they released the steam deck they have added new deck verified/deck playable symbols which are a much better indication of playability on Linux.
Maybe not the best marketing. But I don’t think it is really due to legality issues, more so legacy ones.
It’s probably just to not falsely advertise support when some of the untested games don’t work.
