Board Thread:Support Requests - Getting Technical/@comment-24922135-20171021002325/@comment-1757994-20171021230854

When you say you have had private wikis in the past, unless you mean you have used other wiki farms, then I should point out that there are other wiki farms that will host private wikis.

shoutwiki supports private wikis that only invited guests can edit, but you can decide if only invited guests or anyone can read.

miraheze supports private wikis, but (I think) you don't have the option of allowing them to be publically readable.

There are others, I'm sure, but those are ones I know.