Not all links created using our URL shortener are unique, for example, if you wish to shorten a URL that someone else has previously shortened then we may re-issue the same short link. It is important to note that our short link system has a finite number of possible codes, so it makes sense to re-issue codes whenever possible
The exception to this is registered users. Because we provide click data and analytics as part of our service, we need to provide a unique link when a registered user creates a short link. This is to allow us to provide data that is specific to that short link and not a link that has been issued to other users in the past.
Because there is no analytic data available to non-logged in users re-issuing short links will work fine to simply provide a short URL.