Woolytoes: So? How big is the Gamemarket? This 2% are Millions of potential customers!
Szkodnix: In December 2020 it was 0,78% according to Steam Survey as I verified my theory. So it's a bit less than one million users. Let's be realistic - A year of Linux won't come so quickly ;) I know that for Linux users it's hard to be realistic but yeah... that's just how this world works.
And if the game is on Unity then it sure might be a little less risky to port it to Linux.
Maybe, some steam-games do not work under linux - command & conquer or my time at portia for example. So, people, who want to play it, will use an windows VM or a separate installation in dual boot. So, the linux users will be counted at minimum twice as windows users too.
An other fact is, that not every linux gamer use the steam platform. Why should I run steam, when I've bought my games on gog? - Gog galaxy does not have a native linux support, but it run's mostly well in wine-staging.
But because of the lack of linux-support,gog can not make a serious linux market analyzing.
I can say, more of the systems in my circle of friendship use linux in several instances and they mostly use gog as prefered gaming library. ... and a minor windows dualboot configuration, because of some issues with special windows games like command & conquer - these ones use steam, too, because this games is not provided by gog, maybe it would run in wine, when it would be provided by gog.
OK, my time at portia does not run as it should (no input device work in my wine config - did not find a solution right now), but maybe wine will fix it by time, because they give out an error text with the hind that the feature is not implemented right now.