The numbers released by Steam on New Year’s Day for Linux market share in December 2020 showed a decrease from 0.33% to just 0.57%. This is quite a big drop, but now Valve has updated their numbers and pointed out that Linux is still declining in percentage terms, but not as bad as originally reported.
After rising 0.9% in November, Valve’s revised December 2020 numbers put the Linux market share at 0.74%, or a decrease of 0.16%, but at least not as significant not, which pushed the Linux game size to just half a percent. .
As for the dive in December, there are a number of opinions of Cyberpunk 2077 that increase Windows numbers (Cyberpunk can run on Steam via Steam Play, but with different bugs), an increase in Chinese users and winter game sales that the Linux market share more favored. There is also an issue of increased steam users in general due to Cyberpunk 2077 and also around the Christmas and New Year holidays, with many having free time.
In any case, the Steam Survey results now indicate the Linux percentage at 0.74%, while macOS is at 2.74% and Windows at 96.51%.