control the mind of the subject. If it can force the subject to self-censor, and self-monitor, if it can turn man against man, neighbour against neighbour, it has won. Because then it can scale down monitoring and police, and not be susceptible to the trap of lost productivity.
Ultimately, it will most likely not be only one technology that will set us free, but numerous interoperating ones.
While we're at it, let's also not forget the classic sneakernet.