Use case's can be found in the daily headlines of the news. You mentioned Apple App store, they have been in the news a lot. People just need to start using their imagination, and coming up with simple fixes. Youtube got ticked at a video download app, and is pressuring it to be removed from app stores everywhere.
There is no reason someone can not build a file server, set up a Hive payment system, and avoid all government or conglomerate interference. Buy the app get a hive key to open it with your hive payment via an encrypted wallet message.
But when will someone do this? Its a costly business to setup and operate. HIVE still needs development before it can eg be offered as a payment system, and payment providers and PoS suppliers will be interested to integrate HIVE into their eco system.
I don't know, I am not a business man. People keep talking about use case, seems to me it could be one. I am not a programmer, right now HIVE is used as a payment option on several games on HIVE, so it works as a payment tool.
That was just one example from the news headlines I have seen. A lot of people like to down load videos from youtube, google keeps trying to stop it. people keep looking for ways around it.