The Linux user share on Steam has been slowly but steadily trending upwards, with May 2025 showing the highest point in years. At least since 2018, this is the highest it has ever been in a long time. When you take into account how Steam is always growing, it’s showing that the amount of Linux users on Steam continues to grow nicely too.

Source: Linux user share hits a multi-year high on Steam for May 2025 - GamingOnLinux

Close to 2x macOS. Now I want to know absolute numbers.