Do you not provide any way for your users to restore their in-app-purchases(IAPs)? No idea if that's against Play Store rules or not, and I'm not a dev. But it's not very good, and basically stinks IMO.
Say your users need to reset their devices for whatever reasons, or change to a replacement or a new device? If users report to Google about losing their IAPs, maybe you might be banned, I don't know?