Sounds like they were trying to create the online equivalent of "disorderly conduct." That is, "we don't have any other crime to charge you with but we really, really don't like you, so have this generic charge instead."
It's scarier than that; they were claiming that a TOS violation was enough to charge you under CFAA (unauthorized access, or exceeding authorized access). If that were true, being rude on a message board (that banned such behavior in its TOS) would be a criminal offense. It would be possible to charge almost any person with a crime for "hacking".