Hi Community, I'm a developer considering building a health & wellness iOS app and want to verify compliance with Apple's guidelines before investing development time. BACKGROUND: I want to create an app that helps users understand their health patterns by analyzing various data inputs including screen time and health metrics from HealthKit. PLANNED APPROACH: The app would use a hybrid ML strategy: NEW USERS: Get insights from a generalized ML model trained on anonymized data from existing users (solves cold-start problem) AFTER ~30 DAYS: Transition to personalized on-device model trained on the user's own data for better accuracy DATA HANDLING: Users grant DeviceActivity & HealthKit permissions explicitly Users select which app categories they want to include Optional opt-in to share anonymized data for improving the generalized model Transition to fully on-device analysis after sufficient data QUESTIONS: Are there specific restrictions on using DeviceActivity data and sending them to a backend for ML training ? Are there specific restrictions on using HealthKit data and sending them to a backend for ML training ? Any guidance would be greatly appreciated before I proceed! Thanks!