To clarify, your app isn't designed to fix the issue of privacy (which would be a wild project), but you're effectively offering an app for free so long as you

To clarify, your app isn't designed to fix the issue of privacy (which would be a wild project), but you're effectively offering an app for free so long as you can collect data on users, while giving them the option to pay while you pinky promise to not collect data on your paying users and their behavior? At first glance, this seems like a very difficult business model to scale, as if it works as described you would be denying yourself insight into what makes a user pay and their behaviors.