Ha!
China has a huge foreign secret service. Active in all those countries. Many agents travel discretely and wouldn’t want to be found out.
Just saying...
doesn’t even have to be official secret service. Every Chinese community everywhere has a ‘community leader’ who is a CCP member. Everything is reported back to some committee and maybe someone would get a phone call or a knock on the door with the message to think of their family’s comfort. Very Big Brother