It doesn’t surprise me at all that North Korea has embraced Linux. I did a review of Red Star OS, the North Korean version of desktop Linux a while ago. It’s not something I’d recommend that you adopt for daily use, but it shows that even North Korea is aware of the strengths of Linux and open source software.
If you want a peek at what life is like inside of North Korea, watch the Vice Guide to North Korea videos that I’ve embedded in the review quote above. Each of them runs about twenty minutes and they are quite interesting.