I see, thank you! As I am the admin and the only user, I am the only one who will ever see my public stream, right? So, I don’t have to bother about illegal content.
Not necessarily. You might want to tick the box to only allow authenticated viewers, or else this will be open to the public. See admin/site. There are a few public stream settings. Authenticated viewers also includes remote auth viewers from other hubzilla sites. You may want a setting to restrict this to only local logins but nobody has done this yet.