Chargebacks are problematic for a variety of reasons, especially when you can get logged on a database and find it bites you on the ass in future when you win at another casino.
I've said this numerous times, but there are two sides. If your transaction is to a fraudulent provider who fails to deliver the goods or services purchased then you have every right legally to chargeback.
The problems occur when starting the process - you are telling your card provider that you believe you have been defrauded for whatever reason, but it's down to gambling regulations. The provider knows zilch about these so will only want to know if you got what you initially paid for, i.e. credits. You did, so they will dismiss your claim on that basis, totally disregarding the minutiae of gaming regs that actually endorse the validity of that claim.
So then it comes down to consumer law and as yet unstated legal precedents. Unless there is a case-in-law whereby it's been established that a kosher gambling transaction is NOT just a matter of being given your credits, but also valid licensing, genuine games, fair terms and repayment of subsequent winnings then you have no precedent to get your card provider to facilitate a chargeback.
This is where the gross unfairness of it is centred. YOU and US on here know damn well you've been scammed and the transaction should never have been allowed or approved but the card people have no context to follow.
So this is what happens: you feel wronged and know you are justified in your chargeback but also are aware of what I've mentioned above so rather than make the chargeback on merit and know it'll likely be rejected, the claimant then goes down the route of denying the transaction in the first place in order to guarantee the right outcome.
This means signing a legally-binding statement that can get you prosecuted or arrested for fraud if proven or suspected to be lying, which of course you are. So it's a catch-22 situation. You know you're morally entitled to your refund, but have to perjure yourself to get it. And people like 1668/JAZ damn well know this.