Use of the ESD Seasonal Forecaster app in free-mode does not involve any personal user data collection what-so-ever by EarthSystemData. In-app purchase to access locked features will involve purchase history data collection via our payment client Revenuecat in order to ensure correct functioning of the app.  
EarthSystemData takes the privacy of our app users extremely seriously and does not collect, re-sell, or analyse personal data of our app user community.