Privacy issue: the Wikimedia GeoIP service is silently used in all other wikis (including outside Wikimedia) which may not be aware of that. This service also sets and collects tracking cookies.
I noted that when I navigated (with Chrome) the OpenStreetMap wiki (any page), where the local wikis are enabled, but still it was showing that some wikis were bloecked. It turned out that when looking at details (from the cookie icon displayed in Chrome status bar), the cookies were enabled only for OSM wiki, but you had to click on details to see other blocked cookies, always coming from Wikimedia.org third party.
This extension when installed by default turns to use Wikimedia.org as a third party. The installation documentation should document this so that other wiki maintainers that are scrupulous about privacy can correctly update their privacy statement, or install their own local GeoIP service instead of using the Wikimedia.org instance.