Is there an uninstaller app to remove this app?

This app is free from the App Store, though it features In-App Purchases. What is the point? Why not just make this app $2.99, in the first place? This app doesn’t really do anything useful with out the In-App Purchase of $2.99, to allow you to uninstall apps or files.

DJ Stinky about Uninstaller-OS Cleaner