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Could you tell more about MediaWiki use-cases outside Wikipedia? I know there is a lot of open-source projects which has MediaWiki installed for documentation (i.e. Arch Linux). Are there any usage in "internal documentation" software (like alternative to Confluence)? Why they have chosen the MediaWiki not other software which can be easily self-hosted / deployed on a premise?

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MediaWiki is indeed very easy to self-host. I've been running several instances for the FSF and Sugar Labs.

From the sysadmin perspective, it's a dream app to deploy: just unpack (or git clone) the latest release in a directory, point Apache (or Nginx) at it, and continue in the guided setup process (which involves creating a database, typically MySQL).

Updates are also painless: there's a php maintenance script which updates the schema. I've kept MW instances for ~10 years without running into any problems.

Things get a little more interesting if your add a ton of extensions, or badly maintained ones.

I wish I could say the same of Django and Rails apps! <trollface>

I dont know much about that, but in a previous job 6 years ago we saw mediawiki in quite a few non technical companies used as internal doc system

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