http://www.newsbtc.com/2017/11/18/appcoins-revolutionizing-app-economy/
Regards,
I think this relates to their proof of attention feature, with appcoins advertisers will be able to reward their users by viewing their ads and these coins that are being given by the advertisers can be used by the users in-app purchases so with this advertisers will gain more revenue because they will reach a larger market through appcoins and users on the other hand will support and watch these ads from the advertisers so that they can experience the full feature of a certain app like they can purchase premium items and enter exclusive events or get exclusive stuffs only for premium members.