Reason for Tinder being popular
The reason why tinder is popular is because it provides users exactly what they want. With its unique features, the selection has become much easier amongst the youngsters,

How an App Generates Revenue?
Lock premium features
To generate revenue from your app like Tinder, include these features as membership only access, meaning for free users, these features won't be available or be limited.

Summing Up,
Thus, building a Tinder clone helps gain more users with its intuitive UI and a high-quality app that helps your business grow exponentially. It also benefits your app by being used by users consistently and generating a sustainable income for the long run.