I might need to go back and find sources but I could have sworn I read a thing that had Kim directly saying that it isn’t allowed among the general populace because it’s full of US propaganda. Same reason why jeans aren’t allowed.
Edit: I want to clarify that I would prefer the general populace had the internet so they could more easily educate themselves but AFAIK they don’t.
I believe you, no sources required; my personally held belief comes from a gut feeling and general distrust based on their historical movements.
Their M.O. has always been subversion and misdirection to make them appear stronger than they actually are, so you can’t take them at face value at all.