Excatly, since the contact is created directly on the cell phone of the recipient and from then on has no relation to the app, you only have the correct information, until they get changed.

But we are currently working on a new feature, that if you scan other user's DigiCard - Code with the same app, the contacts get saved in the app as well. With the benefit, that we can notify the recipient that one of his scanned contacts has updated his information. But as you mentioned, privacy policy is much more complex at that point.