The thing is, the casino can only release customers detailed based on demand and that can only happen if their is a discovered case of money laundering but the government will not use other customers details to for fraudulent activities, they will only use it to carry out their investigation on the customer and can know where and when to capture the person if it requires to. While we can give some reputable casino the benefits of doubt, you may not know what is going on in the background.
That's true, because most times while we trust a gambling casino for keeping our KYC details safe, lest not always be 100% sure it's always save, most especially when it comes to submitting KYC details on new casinos who are just new to the gambling business, and in most cases, it's likely to do the unthinkable just to generate more revenue for it's business. But however, when it comes to old casino who has built reputation over time, then on such casino, our details are likely to be safe, simply because they have been into the business for long time, and know the importance of customer's trust, unlike new casinos who are likely to be entice if offered few millions of dollars in exchange of customer's details.