system
A chat on subreddit /r/wallstreetbets
human
That what Casinos are used for. If it was electronic it's already laundered and in the banking system.

gpt
Interesting little rabbit hole there. Not sure how casinos' international accounts work, but depositing his money in an Imperial Pacific account in HK or Macau and then using a credit mirror of that money to gamble in Saipan might be a good way to circumvent China's strict capital controls. 
  
 Money comes in as RMB in China, comes out as USD in the US. Like I said I have no idea how casino accounts work internationally, but Imperial Pacific is functionally a shadow bank.