The nation will not abolish the internet without clear justification. It is widely understood that the internet's presence has become an essential network in all aspects of society. From communication, business, education, e-commerce, entertainment, and more, the internet serves as a vital backbone. If a country were to lose internet access, it would result in the stagnation and suboptimal performance of numerous business sectors. Such a situation would only be detrimental to the country in question.
There are times when such a political crisis can force the situation to go without the internet even though the impact is huge in various sectors. But all these setbacks can be recovered slowly by returning to conventional systems, say, what people did 2 decades ago before the internet became a major element.
Except for North Korea. I am perplexed by North Korea's ongoing restriction on its population, denying them the freedom to engage in activities like those living in other countries.
Infrastructure restrictions in North Korea are carried out by imposing cruel sanctions on individuals, so that they don't need technical arrangements to implement restrictions. Normally, anyone can still access the internet there if they have the courage.