its so easy to hop on a nearby network I have like 20 networks in range and a third of them are using wep a few more wpa 1/2 wich are probly simple dictionary passphrases. if they start sending out letters how are they going to prove who is actually sharing what?
.... how are they going to prove who is actually sharing what?
Unfortunately they don't have to "prove" anything to deny you service. It can be as arbitrary as they wish. It's not like you have a right to the service.