Maybe it's good for some people but as time goes by, those people will surely think, what if they used real money. They will think it will be more interesting to play gambling because if they win, they can withdraw the winning money. They don't think long about what they lose, especially if they lose a lot of money. The gambling app is just a demo for people curious about what gambling is so they want to know and feel and get the experience of gambling, even with free money.