An interesting trend graph of the most diffused distros and their adoption by users over time.
You are misunderstanding the data. It is not the number of users, but a percent of posts to ProtonDB, which only applies to PC gamers. There can be a disproportionately larger number of reports from those who need to spend time tweaking their system as opposed to using it, or that are particularly vocal about sharing their tweaks.
The total number of users playing games on Linux is rising each year. Pop!_OS was the first OS that a lot of people tried a few years ago, and so you’ll see a lot more diversity in choice now. People who are new to Linux, yet particularly heavily invested in it, tend to like to try out a lot of different distributions in the following years.
