I haven't used this app but I think the parent had expected that the data he entered would be confined to the application, not sent to the app developer.
Simple analogy: Would you expect Microsoft to harvest every e-mail address you enter into Outlook?
Outlook is an application, not a web connected service, though. If I enter my email address when signing up for, say, Office Live, I'd expect to see a Microsoft email in my inbox every now and then.
No, but that's not what happened here. You filled out your personal card which will be shared out with everyone you "bump" with. I haven't used the app, but I'd assume this fills some kind of registration function.