We can only speculate about the answer to this question. The bottom line is that any casino can be hacked regardless of its age or reputation. However, protecting data in this hack-prone world is expensive. Buying modern equipment and hiring the best brains in the industry requires lots of money. I would prefer to give my KYC to a reputable casino because they are more experienced and have the finances to invest in security or information protection. But any information you don't want to be exposed, don't give it to any centralised platforms because all of them are prone to attacks. Even if they have the best protections, an insider can leak data for financial gain or other reasons.