Abuse of process
If they really have no intention to eventually sue it is abuse of process. Also if they have no intention of actually suing, how it is that not extortion or blackmail? "You pay us X or Y will happen" even though there is no intention to ever make Y happen and the threat of "exposing" someone as a porn hound is really no different than blackmailing someone with illicit pictures or whatever.
Good for Comcast in any event.