As much as I empathize and feel that some blame should be apportioned to the casino,
unfortunately these events can occur to anyone at any time.
I am just as likely to compromise my personal details online shopping as I am depositing at a gambling site. My card got fleeced for a couple of hundred a few years ago, and I believe the crooks purchased some DIY equipment with it. I knew there and then it could have never been me!
Banks aren't particularly hasty in disclosing their fraud investigative procedures, but I'm certain that all monies will be refunded in time to those affected. It is grating having to wait in excess of a week for this, whilst feeling like the spotlight of suspicion is on you in the meantime.
The only way to avoid this from ever occuring again would be to never make online transactions again, something that is not realistic in this day and age