Im not really sure if there even is a banning mechanism in place for the GTS, besides for bots and spam. I'd assume that they wouldn't have or need a manual ban system in place.
Even if there was one however, it would come with a terms and conditions kinda thing. I doubt there is a section on scamming. Iirc there is only a terms and conditions for connecting to the internet in general, not just for GTS.