This comment suggests that the main target would be non-Chinese, with some incidental Chinese targets/victims. I think the reality is the opposite, and that the primary targets are Chinese, with some incidental Western victims, for the simple reason that both the perpetrators and the (involutary) scam workers are largely far more fluent in Chinese and knowlegable about Chinese financial systems, culture, etc.
Both in mainland China and other countries with large ethnic Chinese populations, there is quite some awareness and media information these issues, e.g.:
https://en.wikipedia.org/wiki/No_More_Bets
https://www.scmp.com/news/asia/southeast-asia/article/323544...
https://www.technologyreview.com/2023/08/30/1078663/pig-butc...
p.s.: From casual conversations with European friends, there are probably smaller scale "native" versions of such scams in many Western countries. Large scam centers with imprissoned workers might be somewhat specific to Chinese/Cambodia.