You are probably right. They probably just want it shut down because they don't want to invest the time and energy to determine whether or not the app is more

You are probably right. They probably just want it shut down because they don't want to invest the time and energy to determine whether or not the app is more beneficial than not. However, I have found that it is quite easy to convince a university administration to listen to your concerns when you engage them positively. I would ask to schedule a meeting with the Chancellor (or someone who would have the power to overturn the decision) and give a positive, optimistic presentation on how the service could reduce the load on the registration system and how you would be willing to work with them to ensure that it will have minimal impact on the service. You might be surprised how seriously they will take your proposal.