Change WordPress user roles and capabilities › Forums › Restrict or Permit access inside WordPress – how to › If no restrictions, user sees everything › Reply To: If no restrictions, user sees everything
If such filter ends with high server load, another workaround is to use an additional role for no-community users instead of work with every user meta data. If you allow that no-community role with access to unexisted post, like ID 99999999, users with that role will see an empty posts list.
From my side I will look if I may add to URE own custom filter to change a default behaviour of edit restrictions add-on. So if you set such filter then all users without restrictions will see nothing.