It depends what you’re comparing against, but I had plenty of games on Linux when steam released their Linux client. 10 years ago was the start of a huuuge shift. It died down a little bit after a few years (I think a lot of developers stopped caring when steam machines petered out and developers started to decide the Linux releases weren’t worth it), but then after a little while Proton started kicking off and the rest is history. Obviously you didn’t have nearly the selection of windows, but there was still selection.