Fortunately, we can say that Ripple is a very secure payment method and that XRP casinos are indeed legal. When it comes to security, Ripple uses what's known as "end-to-end encryption." This means that all of your personal and financial information is encrypted when it's being transferred from one party to another. This makes it virtually impossible for anyone to intercept and use your information without your consent.
Ripple is also a decentralized network, which adds an extra layer of security. Because there is no central authority controlling the network, it's much more difficult for hackers to target.
As for legality, XRP casinos are perfectly legal in most jurisdictions. There are a few countries where online gambling is not yet regulated, but in general, as long as a casino is licensed and compliant with the relevant laws and regulations, there is no problem with using Ripple to gamble online.