The Android Blueduino App is a keyboard driver for the android system. Due to the nature of this kind of software almost every key that is pressed on your keyboard is processed by the app to perform text expansion, hotkey handling and keyboard layout adjustments.
Unless the user explicitly uses functionality such as ‘search word under cursor’, ‘translate word under cursor’ or ‘look up word in wikipedia’ no information is sent over the network.
The Blueduino App does not have the Internet Permission that is required to contact external systems and perform data exchange. No attempt is made to transfer your personal information to another server.
Because of that there is no ad-supported free version of the app since the ad networks all require the internet permission to load and show banner content.