No. A private story is, by definition, private. It's designed to be only visible to those the creator has specifically chosen to share it with. Scanning is an unethical and often not possible way to access such private content.
In most cases, no. Private stories are designed to restrict access and keep the viewers list confidential. Only those specifically allowed by the creator can see it.
No, usually there is no direct way to know if you are on someone's private story. Private stories are designed to be selective and private, so the person who creates the private story has control over who can view it, but they don't typically send notifications to those who are or are not on the list.
No, by definition, a private story on most platforms is private. Only the people the creator has specifically selected can view it, and there's no way for others to see who those selected viewers are.
No, by definition, a private story is private. Only the creator of the private story can choose who can see it, and others cannot view who is included in it.
Well, as a general rule, it's not possible to see if a private account has a story. Since it's private, the content including stories is restricted to the people the account owner has allowed to follow them. You don't have any visibility into their story status until you become an approved follower.
Typically, yes. Most platforms that have a private story feature are designed in a way that the creator of the private story has some level of awareness about who is accessing their content. It's a privacy measure in a sense for the creator, so they can control who sees their more personal or exclusive posts. So, if you join a private story, it's likely that the person will be able to tell.