Steps reads the step counts and distance walked for the past week provided by your phone through the Apple-provided HealthKit framework. The step counts are only stored on device and never shared. Steps uses third-party services to provide a better experience, which may collect personally identifiable information. You can read their privacy policies below:

• Google AdMob: https://support.google.com/admob/answer/6128543?hl=en
• Google Firebase: https://firebase.google.com/support/privacy
• Google Analytics for Firebase: https://firebase.google.com/policies/analytics
• Firebase Crashlytics: https://firebase.google.com/terms/crashlytics-app-distribution-data-processing-terms