How reliable are these casinos and are they likely to scam?
scam has so many different forms. and i can see 3 different ways they can scam.
1) is messing with bets and their results. this is the easiest one to discover specially in games such as dice. since everything is provably fair and it can be proven with hashes and some math.
the solution is checking their provably fair system and checking the rolls.
2) is running away! just like exchanges when they say "we were hacked" and run away. although it has never happened to any legit and big casino as far as i know.
there is not many solutions for this, you can only not keep anything in your account.
3) is faking their results for their investors. this one is a serious one and there is no way of finding it out. there are some suggestions but i don't see a perfect one and i don't see any of the casinos implementing any of it.
and it is simple to do, the casino can create fake accounts and show fake results of a fake whale winning a large amount so that they can pay their investors less profit or no profit.
there is no solution for this.