I think that this will be a good passive income if I run such an app. Not sure if it will work, but I hope it will bring people a lot of fun. In the beginning, it is supposed to be free and win some money. Any thoughts about that?

I think you might be dreaming a bit because operating a betting site is so much harder than you might think. I mean, personally I only place my bets on secure platforms that are verified and that I know are secure. Plus, bonuses are what attracts people, but offering bonuses is hard for small companies. When I look for bonuses, I research sites like https://bestbet.ng/best-betting-bonus-nigeria/ and the ones that are recommended there are well-known platforms that are both secure and have a high income so they are able to offer the bonuses.