Has the WoW crowd taken over now?

[Driavna]

I do see a lot of people say "gg" at the end of content now and I assume that's a WoW person thing because I never saw it much until last year.

People use that as a common courtesy since... forever? Starcraft 1 will be my first memory of it I think. I also can't remember players saying GG as a common occurrence during my years playing WoW.