I remember this story from about twenty years back hitting the news:
https://www.theregister.com/2001/04/12/missing_novell_server_discovered_after/
Missing Novell server discovered after four years
In the kind of tale any aspiring BOFH would be able to dine out on for months, the University of North Carolina has finally located one of its most reliable servers - which nobody had seen for FOUR years.
One of the university’s Novell servers had been doing the business for years and nobody stopped to wonder where it was - until some bright spark realised an audit of the campus network was well overdue.
According to a report by Techweb it was only then that those campus techies realised they couldn’t find the server. Attempts to follow network cabling to find the missing box led to the discovery that maintenance workers had sealed the server behind a wall.
Reddit had the ability to have a per-subreddit wiki. I never dug into it on the moderator side, but it was useful for some things like setting up pages with subreddit rules and the like. I think that moderators had some level of control over it, at least to allow non-moderator edits or not, maybe on a per-page basis.
That could be a useful option for communities; I think that in general, there is more utility for per-community than per-instance wiki spaces, though I know that you admin a server with one major community which you also moderate, so in your case, there may not be much difference.
I don’t know how amenable django-wiki is to partitioning things up like that, though.
EDIT: https://www.reddit.com/wiki/wiki/ has a brief summary.