According to the screenshot he shared(quoted below) on his previous thread, the guy was most likely flagged(for money laundering, maybe) because he tried to withdraw his deposited money to a different address without finishing the wager requirement.

If I’m not mistaken, the withdrawal attempt that failed was using my Binance address, whereas I usually made deposits with my MetaMask wallet. I can prove this as well, but they haven’t even asked for that kind of documentation.