This is not a scam (yet). As your correctly pointed out, casinos reserve the right to request you to undergo KYC verification anytime they want to. This doesn't happen while you are losing and depositing, but when you start to win and want to withdraw, they mysteriously remember their KYC rules.

You can try to talk about this with their Bitcointalk forum representative. He is active and online from time to time. Send him a PM and tell him about this scam accusation thread. Let us know if the account doesn't accept PMs from newbies and someone will surely help and contact them for you.

There could be various reasons why you were asked to verify your identity:

- They suspect you use multiple accounts.
- They suspect you gamble from a banned territory.
- They suspect you of abusing bonuses or any other terms/rules.
- You used a VPN that triggered some alarms etc.

If they insist that you have to perform KYC, I don't see any way around it unless you find a point in their TOS where it says you don't have to but can still get your money back.