According to their forum all their members were requested to spam mass friend requests to people on our servers through steam, then invite them to their servers via that method. Essentially, gg.us is the name for a different server actively trying to advertise to our members. If it is a coordinated attempt to advertise to our members by a group you are a part of, you have to be prepared for those consequences yourself.
"Most people think time is like a river, that flows swift and sure in one direction. But I have seen the face of time, and I can tell you, they are wrong. Time is an ocean in a storm."