Apple reserves the right to evaporate your startup if your app is deemed to be in a "category that is already saturated".

https://developer.apple.com/app-store/review/guidelines/#spa...

> (b) Also avoid piling on to a category that is already saturated; the App Store has enough fart, burp, flashlight, fortune telling, dating, drinking games, and Kama Sutra apps, etc. already. We will reject these apps unless they provide a unique, high-quality experience. Spamming the store may lead to your removal from the Apple Developer Program.