Exactly. No matter how big or small the money in the casino owner's pocket is, if they plan to cheat and take advantage of the customers they have, they'll do it regardless of the status and the reputation of their casino. Although of course, it still is a good rule of thumb to only choose casinos with a large treasury for other reasons such as fast and safe withdrawal and such. But I digress, there are very little chances of Casinos, especially ones that are reputable enough to garner a wider range of audience to cheat on their players. That's just a recipe for failure in my opinion and would equate to them losing their playerbase when found that they are indeed committing these crimes.
There is not much of a reason for a casino to do this, even if a casino owner thinks they can away with cheating their customers, someone will find out this information and then everything they have worked so hard for will disappear, as gamblers will immediately think that if a casino owner is willing to cheat them in this way then they will think about the many different ways in which the casino can cheat them and then never play there ever again.
for a casino that starts from scratch until it becomes popular and reputable, they will think long term if they want to deceive their customers. because casino owners know that establishing a casino and gaining the trust and good reputation of customers is very difficult and not easy to get and if they are caught cheating their customers, they will certainly lose their reputation.
from other things, casinos that already know their own struggles when starting a casino from small to large, they will never have to cheat their customers. because they know that cheating a customer with only a small amount but losing their reputation is very bad.