If this stands, this sets a terrible precedent. Suppose some ambitious prosecutor has decided that you must have committed a Federal crime by using a pseudonym to have a nasty war of words with someone on a chat forum on a politically touchy subject, in violation of the Terms of Service? He can use this terrible precedent to railroad you on charges of "unauthorised access", claiming it has nothing to do with, say, opposing abortion on demand, or supporting it, or whatever. If you don't think this can happen, well, it *has* happened, over and over, with other laws meant for originally limited purposes. The anti-Mafia RICO laws come to mind. There is indeed a slippery slope here, and a steep one at that.
Prosecuting what can only be called a venomous viper isn't worth it for what it'll cost all of us.
You might also find it mildly interesting to check out this slightly newer thread and this slightly older thread at The Volokh Conspiracy, both begun by Mr. Orin Kerr, who is one of the attorneys for Ms. Lori Drew.