That's all BS. As long as they don't request KYC before depositing, it's great for money laundering. Lose 100k in 9 casinos, and win a million in another. The 9 casinos don't know who you are, and in the one casino you go through KYC and end up with a million bucks legally won "because you were incredibly lucky". Casinos don't mind because they profit from it, and they only ask KYC because they don't like paying.
I don't follow you. For starters, most of them have mandatory KYC when your account exceeds 2,000 USD and it counts the sum of deposits or winnings. I mean: you deposit 10 USD and you win 2.000 USD for a jackpot and they ask for KYC, so I don't know where you get your argument from.
Do you gamble in bitcoin casinos at all?