I don't understand why they needed such confidential documents about your identity and your revenues if they just wanted to close your account. If they were investigating something about you and how you place this bet why not asking any question about that?
I wonder if any other bookie, especially fiat and licensed ones has seized customer funds for that bet.
Draftkings is holding money from the accused player and those involved that made the bets at Draftkings. The other books returned the money and didn't confiscate balances.