Though my app doesn't implement ATT and has declared Data Not Collected in the privacy section, Apple has rejected its update for many times, saying
Apple also says:The app privacy information you provided in App Store Connect indicates you collect data in order to track the user,
The point is that the app does not include ATT framework nor the AdSupport framework. It is a paid app and does not include ads sdks either.If your app does not collect user or device data for tracking purposes, please update the information you provided about your app’s privacy practices in App Store Connect.
I have repeatedly requested Apple to tell me where my app had declared that it would collect user or device data, Apple never answered directly, and finally suggested:
Since the app does not implement ATT at all, I come here to ask for your help.
Review developer documentation for the AppTrackingTransparency framework.
See Frequently Asked Questions about App Tracking Transparency.
Ask fellow developers and Apple engineers a question in the Apple Developer Forums.
Thank you in advance.