You want to favourite this toot:
Here's a remainder no 85,234,567 as to why you shouldn't base your business around a product that depends on:
a.) Distribution via a proprietary app store where your livelihood depends on the mercy of #Apple / #Google
b.) Build your business around consuming 3rd party APIs (and maybe presenting them differently), thus being susceptible to the whims of all the parties you depend on. Encroach on their territory with a better product and THEY WILL shut you down.