The UN estimates that there are 100,000 victims of human trafficking to work at scam call centers in Myanmar alone, and many of those are Chinese nationals. https://www.dw.com/en/how-chinese-mafia-are-running-a-scam-f...
The problem is so bad and well-known that a movie was published in China’s strictly censored market and made $500M at the box office. https://en.wikipedia.org/wiki/No_More_Bets?wprov=sfti1