Freemium

Excellent business model.
As a rule, Freemium-application has a set of basic and additional functions that the user can purchase already for money. The premise of the model is to attract people to the application with the provision of a set of basic functions. Over time, some users want more, and they start to buy additional features. The main thing here is to collect a large number of users and to interest them with your application for a long time.

An excellent example now is the game Angry Birds. Rovio provides the application for free, but some features are hidden until payment, including additional levels, empowerment of birds and others. The game is very exciting, so users play it for months and some buy extra opportunities for money.
By adding a model of crypto currency technology into this business, the partner network and the audience coverage of people are significantly expanded. It's easier to get and transfer funds.