I can't seem to follow the story but was asking a KYC was close to scamming? I don't think Duelbits will hurt their reputation for hundred of dollars in here, and the proofs provided doesn't tell that much though for the whole story. Since they opened up an AML and KYC policy maybe they suspected a wrong activity on your account. No, casinos asking for KYC isn't close to scamming if they just wanted to dela with the regulations, they're licensed after all.
You may have missed some points in the ops message, according to him KYC was demanded after he inform support of his intention to close his account and wanted to withdraw his remaining $10 from the account and even ops still said he lack evidence to back his claims, and that lead us to the question of who is telling the truth since Duelbit side of the story is not hard and ops failed to supply any evidence to support his claim.
* Ops your story is not enough valid reason to call out Duelbits as scamming customers, since their have long track record of good reputation to risk it all away on a small amount as $10.
* lesson for you ops, before you mention your intention of account closer to any casino, make sure to have withdraw all your balance from the site.
*Since duelbits is a KYC casino you should be ready to provide them with all necessary detail the requested for at any time.