To the OP's credit, this is explicitly called out in the whitepaper introduction. I think the point is that this app makes casual, "in the heat of the moment" backstabbing pretty difficult.

In my opinion this is fair, because the vast majority of bitter/petty ex's are not going to know how to, or bother with, reverse engineering an app to spite their significant other. They'd also have to do it when they're granted access to the app, which implies a certain forethought.