1.) They didn't advertise. They whispered a player to come join another server, aka the only reason you guys know about this is because the player was streaming.
2.) Despite what those people are saying they still play FG.
3.) They are top players, by banning top players you are reducing the chances of people coming to FG to play. (Gunz is a tight-knit community, if their friends are banned they won't come to play).