Letter Rooms takes privacy very seriously. It does not collect any data that is linked to you. It only uses TelemetryDeck to collect anonymous usage data to better understand which features are used and how your experience with the app can be improved. If you want to learn more, you can click here to read the TelemetryDeck privacy policy.
Your achievements will only be synced with GameCenter if you have signed in to your GameCenter account.
I want you to enjoy the game and have no interest into harvesting your data. If you still have any questions, contact me at: support@strasser.app