Well... potentially kidnap you and bring you to China, if you don't comply. They supposedly "convinced" 230,000 Chinese nationals from April 2021 to July 2022 to "voluntarily" return to China to face criminal charges, complete with over 54 "international police stations" and a new law, going into effect this December, claiming extraterritorial authority over their "citizens" for certain crimes.
This, along with other incidents, show that China is more than willing to harass people outside their country, at a minimum.
https://safeguarddefenders.com/en/blog/230000-policing-expan...