Something funny that I noticed is that German PC gaming magazines are now saying "Sie" to their readers. I guess it makes sense - most of them are adults and some of them not even very young adults these days.
Why "now"? I used to read the PC Games a decently long time ago and it was always "Sie". Same with the PC Action and Computer Bild Spiele. No clue about the Gamestar but those were basically the relevant PC gaming magazines.