Disable alert: "Cellular data disabled for [app]"
Sadly, there's no way to stop seeing that alert every time you open the app from the cellular data network.

Every time the app tries to connect to the Internet, then you'll see that alert.

In fact, there is one way you'll probably won't like, but just in case... If you put your phone on airplane mode, then you won't see that message (though you'll see the annoying "no data connection" if you perform any activity that asks for connection anyway).