My very first iPhone app was a Yelp client called Places. It launched on day one of the App Store. I worked closely with Yelp on the app, sending them screenshots, talking about API limits, etc. They never told me that they were also working on their own app. To my surprise the App Store launched with an app from Yelp that looked exactly like my app Places. Soon after they started limiting my API access and changed their terms of service to only allow access to 3 reviews per restaurant. They also injected text into my API responses telling my users to download the official Yelp app. In retrospect I should have known not to build an app entirely on a third party API, but the situation could have been handled more professionally for sure.