In the current share widget, the provided short link leads to the App with the URL www.arcgis.com when it is shared to the public.
I would prefer that it leads to the App under the subscription, i.e. myOrg.maps.arcgis.com. This way, users will know what organisation is behind the App.
The reason for the designed behaviour is to keep the redirect, even if the organisation decides to change its subscription URL (which is IMHO a very rare case...)
An enhancement request has been logged for this (ENH-000100182), but the support team suggested to create an idea in order to see if there is a real need for it.