Seems you got more out of the horrible link than me :) It is bad.

Having been to many a Chinese Internet cafe 网吧 in China and Japan, they have all run windows. I think steam keeps getting blocked or something by the gov as well. You’re right that piracy is very commonplace in China too. I bet it’s a decrease on steam use not windows.

Still, what a weird way to say less Chinese users. Also simplified Chinese is a written language, why don’t they just say mainland Chinese?