You know what, if you can "prove" beyond a reasonable doubt, that I'm giving sensitive information to the enemy. Then you can kill my online account and force me to start over again. As close to standing me up against a wall as you can come in an online game.
Not near as many spies as people think. There are however a number of people who are extremely good at guessing where the next enemy mission will show up at.
Except for the fact of what happened when they got caught in WWII.