The thing is that we humans are not great dealing with probabilities in our minds, so the casinos and other gambling companies simply use this fact in their favor.
It's not natural to think about probabilities, we are just not good at it. On the other hand for example we are great at thinking in terms of Newtonian physics, we don't need to calculate an equation to know how to throw a rock for example, yet we can think perfectly well how to do it. For probabilities you actually have to calculate the math behind it.
That is if we only calculate the probability in our heads but we can always use a calculator to know the exact chance we have. This is necessary so that we will know if it's worth it to continue betting on that game or we should stop fantasizing that huge win because we can only burn more money in the process. We can even lose more than the reward that we are chasing.
There is more than the odds that casino use to attract their customers. That can be the bonuses and other great services that they offer. There is no way that a casino can say that the odds for their game is is lower when in fact it is actually higher. Players will soon find it out and they will be reported.