I hope this is allowed to bring up, as it is relevant to this conversation but not WordPress related. There are online journals out there that were designed to actually be private (not a publishing tool, not just a private ‘checkbox’). They are hosted services on the internet, but encrypt the database entries during storage so the system admin can’t read them either. The one in particular I am thinking of is https://www.myejournal.com, which to disclose I am affiliated with. Hope that helps.
