Peace be with you PabloEscabor; you have an interesting user name,
My uncle won a lot of money at the casino on his first visit, gambling was an easy income. But winning is probably the worst thing that can happen to a gambler, it gives them a false sense of hope. My uncle then went on to loose all his money, a successful business, his house and his wife. He spent the last sixty years of his life trying to win it all back, but died in poverty.
If you are going to run a casino, you will want people like my uncle. Most people who gamble, can't afford to loose. They gamble because they need to win to pay their bills, gambling is a terrible addiction by people who are desperate for money. You often hear the adverts saying, gamble responsibly, and after the health warning you then loose your money. But the only gamblers that gamble responsibly are the casino owners, they fix the odds in their favour. Loosing shows a lack of responsibility, getting into debt gambling shows a massive lack of responsibility, it destroys lives.
What if I spend all my wealth I earn with my online casino on building humble mosques with a rehab and homeless shelter?
You would be willing to take wealth from others and call it yours?
If you want to build a mosque and help the homeless, then I would suggest finding another way. Gambling can make people homeless.
These are my own thoughts on gambling, I am not in a position to say Islamically what is right or wrong.