The fluctuation in Simplified Chinese use makes me pretty suspect here. It was nearly cut in half in one month and suddenly 20% of Steam’s users that used Simplified Chinese just didn’t exist.
Honestly that big of a fluctuation in regional selection tells me none of the other data means anything.
Steam Linux Marketshare Surges To Nearly 2% In November (www.phoronix.com)
store.steampowered.com/hwsurvey/