Even in Orwell's 1984, you could escape from the watchers because they were human. How would you like to be watched from by a computer, based on what you buy, how you buy it, when you buy it, what else you've bought recently, and all other sorts of things like that? Better be careful buying bleach over the internet if you're a farmer... if you buy fertilizer within a couple of days of the bleach you might find the FBI at your door if they could have their way.