So your wife's use case would be : she would create a petition, her users would sign it, then she would download their contact details, correct? What happens to the petition itself? Is there any action on it?
Just as much happens to it as usually happens to a petition. If you get enough signatures, you present it to whomever you think should care: government body or local news or whatever. There’s even a chance that they actually care and it makes a modest difference in some legislator’s deliberation or generates some publicity about the issue.
Hey, I see what you're on, don't steal my prospect :D (joking ;))