This reddit post says:
As seen on the recent GameDiscover article, Valve’s Steam presentation at GDC confirmed that Simplified Chinese has ever so slightly surpassed English as the primary language on Steam. Important to note, this isn’t based on the ever-fluctuating hardware survey that Steam has. It is based on a report straight out of the horse’s mouth.
That last comment is insane. They sound like one of those people who believe that video games are a waste of time. Meanwhile they’re probably browsing the Internet all day and slurp up all the propaganda against US enemies they come across.