Or it can be auto-triggered. I remember a history of a Call of Duty game were a number of players were being annoying, cheating and making the game horrible to play. Someone wrote in the chat "Tiananmen Square massacre" and instantly more than half the players were disconnected.
Or maybe if you keep the convo about KJU being fat, you trigger an alarm that schedule a police visit to your house, in a state were they first act and then ask.
In a communist/totalitarian regime, you don't want to give informants any leverage. The fear of it being recorded and used against you is enough. Also, if the regime were to give permission to speak in this manner, it risks normalizing irreverence toward Kim Jong Un, including employees working in espionage.
Or maybe if you keep the convo about KJU being fat, you trigger an alarm that schedule a police visit to your house, in a state were they first act and then ask.