On Steam https://store.steampowered.com/hwsurvey/, all Linux operating systems combined have around ~2% users, compared to the MacOSX ~1.4%. This is only a recent trend, as for the longest run Mac had more Steam users than before. And building a native Mac game was more straight forward than on Linux.

Nowadays its completely different than before, thanks to Proton integrated into Steam. This means even though there is a higher percentage of Linux players on Steam, there is less reason to make native Linux games. That has some advantages: Windows binary through Proton has feature parity without the devs needing to understand the underlying Linux system and libraries, less work for the developers means higher probability of supporting Linux for longer time, thanks to Proton and the auto selection of Proton version for each game its also less worry for the end user. It does not matter what system libraries you have installed or what operating system you are using.

It would be nice to have, but in reality there is no real need for native Linux games from developers or for the end user / player.