The admins think that if a formal alliance unites to take out all pubbers that is wolfpacking. This the admins believe it disturbs an enjoyable gaming experience hence, is a violation of the ToS.
Also the admins say that in public games alliances can't be predetermined.
Even a smaller number of people in a formal alliance can be considered wolfpacking, if say 3 people from the SNA were all become allied to unite against pubbers in many games.
There is no magic number of alliance members uniting together to define wolfpacking.
If you are still unsure of what is wolfpacking or not wolfpacking. Then you should message Rage or Euphoria and ask them to give you a few examples of what is and what is not wolfpacking.
Moreover, the wolfpacking rule doesn't apply just to alliances. If a group of real life friends unite and gang up on players they can be punished. This however, is harder to prove as they mite not all have the same tag next to their name.