Sorry, let me clarify:
In our installation, the Meta category is not restricted in any way. However, there are a few sub-categories, e.g., Leadership, that do have restrictions in place:
Leadership can… Create / Reply / See
staff can… See
However, what you see in the view at Categories - OpenMRS Talk under the Meta parent category, shows several topics that exist under the “restricted” Leadership sub-category. While not signed in, if you click on most of those topics listed to the right, e.g., “Out-of-the-box software”, you’ll get the “You need to log in to see that topic” error message.