AT&T has modified their Terms of Service to bar their customers from griping. Their new terms of service now includes language that states they can terminate your connection for doing things that "tends to damage the name or reputation of AT&T, or its parents, affiliates and subsidiaries." An important distinction: the threat gag is just for the DSL portion of AT&T, aka BellSouth.
I don't expect it to work; actually, I expect it to backfire. Case in point, I'm going to slur the name of AT&T in this very sentence when I would not have otherwise:
the halls of AT&T are nothing more than a powder room for dandies, johnny-come-latelies and fops; the same is equally true if not more so for AT&T's parents, affiliates, and subsidiaries.The glove is thrown down, AT&T; your honor has been impugned. [via]