You lose and then tells that the casino is a scam website. In the first place, you know that gambling is a game of chances so if ever you lose then it's all done and up to your chances and the same goes as you win.

They do but it's that you're not lucky at all even with all of the math that you've explained. If they have stolen your money instantly then you aren't able to gamble and enjoy their games. They'd just straight up lock your account and your money is gone but no. Do not gamble and stop it, your addiction has given you lost in your understanding about the chances that every game is giving you.