What an ignorant comment. I hope you are a clueless teenager without any knowledge about history and the state of affairs about North Korea, because if you are an adult it is serious... It means you must be American lol
Well, joking aside, let me tell you: North Korea doesn't have internet, period. NOBODY in the hermit state (why do you think it is called "hermit"?) can access the internet, with the exception of *very few* ultra elites (and even them don't have freedom to browse anything they like, their proxies block almost everything.)
So what you propose, cutting all access to internet to the whole country, it is something they have been already doing it for themselves to avoid any kind of western influence to NK citizens. Their main worry are that their citizens would learn that other countries actually have a better standard of living that NK or get their heads contaminated with dangerous ideas such as "freedoms" or "democracies", which could sparkle discontent and ultimately a revolution.
BTW these cyberwarfare operations are not done from North Korea, but from China. Not with an network connection to China, but geographically from China.
The best CS graduates from the university are shipped to a specific hotel in China which functions as the base of training and operations for the North Korea intelligence unit, training NK graduates to become hackers with the assistance of seasoned Chinese hackers. That specific hotel is the base of operations for all the hacking, ransomware, cryptocurrency heists, and these IT workers fraud, etc...
These "remote IT jobs" aren't from individuals in North Korea trying to get a freelance job, these are all intelligence officers trying to have a two pronged objective: siphon out money and gather information of targets as an insider.
So what's gonna be your next genius idea? Cutting the internet to China? Haha