[w00t]

p2p networks aren't using standard ports, for one. Second, sending out packets to 20 different IPs, domestic or not, and getting back a sum of hundreds, if not thousands, of MB isn't normal protocol behavior.

Your assumption is fine, what you, and most other people fail to recognize, is you don't have a right to your ISP's service. If they don't want to continue serving you, they aren't obliged to. They don't need to provide any reason at all, if they give you what you paid for, but choose to not continue serving you, it's within their rights to do so.