We have the ability for a hub to be marked as "preview" and the hub owner can set widgets as public and private, and these widgets only show up if a user is logged in.

For 1.0 / MVP we recently decided to make hubs login-only, so this feature does not really make sense any more, so we should remove the UI elements from hubs.

Note also that there is a "private" status for hubs, so only group members can view, i think this can stay.