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First, they don't care about the money came from.
If they ask you to do verified, then it's their policy service. You are registered in the site and check list the term & condition right? not being forced to checklist the term & condition by them.
This kind of things, are happening in not only here but every casino. So that's why, I never trust non-kyc offer from CASINO because in the term & condition they always have some rules. "Casino have right to ask us KYC, any time in some case".