Re: satellite intarwebs save the day!
Sure they can't - that is, until somebody has the bright idea to shoot the sats with missiles.
Granted, there aren't many missiles of this class, but it's a matter of manufacturing speed. Or how long it takes for somebody to figure out to use conventional missiles to shoot the receiver.
And we could jettison all plausibility altogether by starting throwing tactical nukes everywhere. Not only will it destroy the receivers, but it could also reduce the number of people who want to circumvent the rules, since, as Tom Lehrer always reminds us, We Will All Go Together When We Go.