Hooked to Pretty Link ;-)

There is no hook in place for something like this unfortunately.

This is not very elegant, and not permanent, but for right now it works ??
If the user is not logged in, PrettyLink won’t work:
https://xp3.us/s/m5

That works. You could setup a hidden page on your site that has some prettier text. Then do something like this:

if(!is_user_logged_in())
{
  wp_redirect(get_permalink(PAGE_ID_GOES_HERE));
  die();
}

Thank you for the tip!
I really like Pretty Link as an added layer of privacy and consistency.
When my external links change I just go into Pretty Link and update them there, instead to scan my whole website, and risking 404s, out of date bookmarks and confused users.
I am not sure if you advertised this aspect of your great plugin.

WordPress is quite a beautiful platform… Code is poetry.