Comment by strogonoff

All of your examples require, to successfully attack one target, a level of effort (hiring human spies and keeping them happy so that they don’t whistleblow or swap sides, planting physical bugs, etc.) vastly incomparable with a level of effort required to attack millions upon millions of targets; and just as incomparably higher stakes of an unsuccessful operation (actual people going to jail, versus being perfectly safe in a jurisdiction that does not extradite).