Isn't it more alarming? There are a lot of innocent gamblers that would enter their wallet private keys that they stored Bitcoin. Of course the system saves the private keys; otherwise, your account won't open there. Even this system is encrypted, but still there is risk. I don't feel comfortable logging in with a gambling site through the private keys. I know we can create a new private key for gambling there. But newbies or innocent people would use their existing private keys, which would be the reason for lost funds. Just stating the possibility. Login isn't an issue for a legit casino.