I don't store your data, full stop. I physically can't. I have nowhere to store it. I don't even have a database to store it. So even if you ask nicely to see your data, I have nothing to show you.
I don't have any intermediate systems which store your data. I have no analytics in this application. Advertisements are served either on a schedule, or at random. They are not targeted.
Payment processing is handled by Apple. I do not process your payment data. If you need to cancel your subscription you can find the option in your iCloud account.