I like that, but unfortunately, when the user resubscribes to the app (which had also been completely uninstalled), it still signs him up with the virtual email address he had formerly been assigned before I upgraded to pro.
I even copied the app to a new app and upgraded that to pro. It’s not forgetting the virtual email it already assigned to them.
As a follow-up, I found you have to delete all user data using both their real email address and the virtual email address. Or perhaps just the virtual, but I know just using the real email address did not work.