They can stop it, it just depends on how far they are willing to go. A false-flag or real EMP from NK will wipe-out millions of Bitcoins and its market along with creating massive civil unrest and starvation. A war will then spread across the globe and whatever comes with it.
Much of this spread of freemarkets is stemming from internet and open source concepts, which can be put to a stop by shutting down the internet or highly regulating its use. So, nothing is out of the bag.
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