I was just thinking about the people, signing up for online gambling without knowing the consequences of their actions. In many countries, online gambling are not allowed.
being legal or not is for the owners mostly. in other words you can't live in one of these countries that have a law against online gambling and run a gambling site.
for users it is not so bad, the chances of law asking you why you were gambling online is low and the worst case scenario is a warning sent to you by your internet provider.
So even if you win the $$JackPot$$ at these Bitcoin Casinos online, you would not be allowed to withdraw that money, legally into fiat.
it is bitcoin, you withdraw bitcoin and then sell that bitcoin to fiat. if you are worried you can even run it through a mixer.
A lot of these casinos knows this, but they still accept your bets. They do not have to pay you, if you signed up with their service.
So how many people know their laws and what is allowed in your country regarding online gambling?
all that said, it is better to know the rules in your country before doing anything money related and use all the precautions.