I understand that the objective is to, pardon the language, detect the "creeps", but somehow the app itself feels creepy, too :/ Somehow I wouldn't feel comfortable even installing it. Not to mention my own privacy concerns.
The app runs sandboxed, doesn't have access to your personal files, and meets Apple's privacy requirements as well as my own. That said, not everyone will be comfortable with it, and that's fine.
Edit: re-read the description and I suppose it makes sense if you share your password