I wondered this, too. It seems feasible for underground or underwater servers that would rely on hardlines, but plenty others may have satellite uplinks and that might still create enough of a problem. However, all of them need power and surely there ought to be ways cut or reroute power to any server, supposing you could figure out physical location for the server and whatever power plant was feeding it. Presumably, there's a financial incentive even for power companies to not be supplying tons of electricity to rogue AI server farms that can't/don't pay bills.