From an article by Palko Karasz in the New York Times:
“Promising its users protection from the prying eyes of intelligence services, Telegram has become one of the most popular instant messaging apps in the world. But providing a platform that allows users to evade official scrutiny has brought its own problems. In recent years, the Islamic State has used Telegram to organize terrorism plots, disseminate propaganda and claim responsibility for attacks. Now, citing national security, the governments of Iran and Russia are leading attempts to block the Telegram app.”
Other governments probably would like to also ban all methods of private communications amongst their citizens. There are lessons here to be learned by anyone interested in privacy, regardless of the country in which the person lives. You can read the full article at https://nyti.ms/2IdcItk.