Illegal affairs can be, but is not limited to
-DDosing
-Doxing
-DDos Threats
-Dox Threats
-Swatting
-Swat threats
-Leaking of personal info can be name, address, ip, etc (falls into doxxing)
-Pizza bombing
-Sending Ip grabbers in chat
-Fraud
-Predatory behaviour
Selling accounts and In-game...