This is your opportunity to start in one of the most profitable online businesses: gambling.
How does it make money?
Well, when people make deposits and gamble on your site, they will 100% lose if they continue playing. The adage "The house always wins" is true in its entirety due to something called the "House Edge" that gives the casino a statistical advantage.
while it is easy to say and quite true that "people deposit and would lose in the long run", the process of how to make it happen is quite hard. it's not easy to attract gamblers and it is not easy to find regular gamblers among the people who gamble on the gambling website.
Being gamblers I hate to hear that gamblers will always lose money in the long run. I think this slogan may not work for you to get your business running as people here believe and hope that gambling will change their fortune.
Also OP did not mention the price of online casino, which i think will be high and most gamblers here may not afford it.