What does Stuxnet have to do with this?! It was a worm spreading via USB sticks (if autorun/autoplay was not disabled on the victim's machine) and had a payload interfering with SCADA systems (industrial controllers).
More cyber war, Stuxnet was really just the first major example of cyber warfare.
Write it to take down any comp running a bitcoin node. PLC's it was messing with, which is pretty crazy because no one ever thought people would write viruses for PLC's.. These control the back-up power to everything.. Done a bunch of back up systems with PLC's, due to the air-gap no virus protection is really thought of.
Although to get this on to all of the nodes would not be an easy task.. if even possible.
I know of people writing "locks" for the code if the customer is known to not pay.. Well hey what do you know after 3 months it won't work and you haven't paid.. shame. That is some shady stuff though.