Look, I think federalism is stupid, and best understood as the Framers' attempt at a jobs-program for lawyers. That said, it's not unreasonable for State AG's to chaffe at a federal telecom law preempting their state criminal laws. Legislating criminal law is one of the core function of the individual states. Yes, that makes it complicated if you're an internet company and operate in 50 different states with 50 different criminal laws, but well tough nuts. At the very least, this letter is not some far-reaching attempt to gut the CDA's protections.