One of the scariest things you can tell potential casino player is the story about online casinos being hacked and players' personal information being stolen. Fortunately, such situations are so rare that shouldn't be taken seriously.
The thing is, hackers are not that interested in "breaking into" online casinos. Of course there is the possibility of genius cyber criminals bypassing the most extreme online casino security. But they won't be able to benefit much from that.
A lot of players prefer to use online payment systems instead of credit cards when depositing at online casinos. Even if we suppose that hackers got information about players' financial transactions, they would have no chance of using it.
If we are talking about credit cards, then players are advised to set online spending limits, and enable additional security measures such as SMS verification codes. This recommendation is important and should be followed even if credit card holders do not use their cards to deposit money into casino account.
Theoretically, after hacking an online casino, computer criminals can influence game results and even make the game pay jackpot. But all big wins go through the casino security, and this is when the fraud will be detected for sure. Of course the payment won't be made.
The only goal of hacking online casino can be to blackmail gaming operators and demand money. Hackers might block the access to casino website, so that players will have difficulties signing into their accounts. Another scenario is to let gamers play, but constantly interrupt the process. That's quire annoying, and if problems are not quickly fixed, players start to consider new casinos.
Most of the times online casinos get control over their website back within several hours. And then they work on improving their security measures. Meanwhile, we can draw conclusion from online discussions that hackers demanding money from casinos usually don't receive anything. Whatever happens, players' money and personal information won't be at risk.