He was putting in thousands, about $5,000 USD. They were letting him withdraw a few hundred here and there. Then he won something like $10k that’s when they did a Know Your Customer check. Which he failed, obviously. They kept his principal and his winnings, lol.
Hopefully he took it as a lesson. Not much else he can do. They said on their terms of service Americans were explicitly forbidden. Not much recourse.
I’m not saying it was illegal or anything, just that they probably make a lot of money turning on the KYC after big wins. They’ll never do one to a losing customer.
In that sense, I do believe it’s a bit tricky.