Confusing - what about the free github and gitlab wikis? And all the free wiki hosts? And tiddlywiki which has been freely hosted tons of places for 20 years or so?
Don't fall for the trap; those aren't wikis. Just because someone (or a company) uses the word "wiki" when describing something, that doesn't make it one.
Perhaps you don't understand what a wiki is, but there are hundreds or more implementations of every reasonable etymological interpretation of the term. If you have a particular narrow version of it, that's not universal or helpful.
I was actually specifically thinking of a MediaWiki instance. In this case there wasn't a codebase to version control so I didn't think of github and gitlab as options but maybe that makes sense. I don't know about tiddlywiki -- does that work for collaboration? It says "personal web notebook" so I sort of assumed it wouldn't have the multi user admin setup that mediawiki does.
