You are not counted as windows user if you are playing games with Proton as long you are using official Steam client for Linux, if you are using Steam for windows and running it with WINE then (i think) you are counted as windows user

steam package from rpmfusion is not official

Like that, but default on Steam client and store game page.

And now Valve needs to figure out how to tell users which game works and which game doesn’t work. Maybe some kind of badge for Proton?

Who is this for?

its not :c