Many Chinese citizens periodically receive messages on their phones from the government asking them to take a covid test, otherwise the status of their QR code will change color. Because of this, Chinese citizens stand in queues for hours even in rain or snow, otherwise they are put on the "black list" to participate in the life of society. QR Code Levels in China - Color breakdown:
?Can freely participate in the life of society
? Cannot enter shops or public transport (prohibited)
?Detention and sending to covid camps