Why is Bitcoin a threat to China? Is China deliberately imposing sanction on BTC

China has always imposed sanctions on bitcoin and China has always called it a conspiracy. China believes that if the world became rich because of bitcoin, no country would need China. This is because people will become economically prosperous, which will reduce their dependence on China. On the other hand, members of the Chinese Communist Party are very interested in bitcoin. I don't think China will ever call the bitcoin a legal currency, But a time will surely come when China will have to trade by buying bitcoins from the world.