Linux market share on Steam over time (Sep 2023 - 1.63%)
Source: https://www.gamingonlinux.com/steam-tracker/
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What happened in squint eyes March 23?
After looking at the other graphs, it coincides with a spike for simplified Chinese, which means for some reason a lot of people in presumably china were way more active on that month.
Valve screws up the survey surprisingly often. As you said, usually PC cafes (which are very popular in Asia) skew the data when that happens.