This is a foolish requirement.
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VERY foolish.
Those people who won't/can't provide those requirements should merely avoid such a casino.
Yes, but the problem is that they are asking these requirements when you already deposited some money or won some bets, and want to cash-out.
I wonder if that requirement is mentioned in the TOS. Otherwise, how will you avoid it if you have no way to know it on beforehand?
Gambling sites, exchanges and other platforms that are centralized can ask for this. If you read about the anti money laundery and counter terrorism financing policies, you will understand why they can ask for something like that. It is possible that the coin is traced to something illegal. Although, that does not change the fact that most money that can be linked to illegal activities are in banks and also the ones that are commonly used for daily transactions.