I think it is used by some people there, government can't ban Bitcoin as long as there is Internet connection accessibility.
But they certainly can monitor, trace and steal your funds. You don't think that Kimmy isn't going to seize any bitcoins he sees attached to your IP? Think again. That's not how dictators work.
That's how he control that place no one can complain about that this man controls everything inside his jurisdictions and not even a single person try to contest that Kim will just grab your bitcoin if you dare to use it inside n.korea