Yes. Spaces within this Wiki are not publicly accessible by default, but they can be made so by Space admins. Publicly viewable spaces are valuable in many scenarios where projects wish to share across organisation boundaries where information is added and kept up to date in a fluid and responsive way.
It is vital that those creating content that is publicly accessible should be aware of the various regulations and guidelines which apply. See the following for more details.
Please note that anonymous access should be restricted to viewing only. In particular anonymous users should not be able to post comments. This is to avoid automated comment spam defacing the site.