

1/3 of the Steam + Linux market, that accounted for an incredible 1.45% of Steam installs in February. This means there were roughly 67 Windows gamers for every Linux gamer (using Steam) that month.
So even if Linux gamers are 10 times more likely to care (and pay for) for game preservation, you are not even approaching the number of Windows users that might. Suppose 90% of Linux gamers care, while only 9% on Windows do, you still have roughly 9 Windows users for every Linux one. And this is a very generous assumption to make.
Maybe, eventually, at some point, this makes sense financially. But if your goal is to be profitable, you grab the low hanging fruits first, not invest in maybe 10% more potential users.
I can understand people not wanting to learn a ton of CLIs, I cannot understand people refusing to use any at all. They have the distinct advantage that you can copy + paste stuff, whereas in Windows you sometimes have to follow like a dozen steps to do whatever you want to do in a 2000s GUI.