The [[ https://www.mediawiki.org/wiki/Extension:Listings | Listings extension ]] is used on Wikimedia on Wikivoyages only.
According to its own description at https://www.mediawiki.org/wiki/Extension:Listings#Deprecation the extension's functionality can be achieved using standard templates. Some Wikivoyages such as de.wikivoyage (T206102) and it.wikivoyage (T253096) have removed or are in the process or removing the extension. On other Wikivoyages such as es.wikivoyage, looking for `insource:/\<(buy|do|drink|eat|listing|see|sleep)/` (same search @MaxSem performed back in the days (T206102#4825809) returned zero results.
The extension maintenance over the past 5 years [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/Listings/+log/master | are mostly build updates ]].
If this extension is deprecated and unused in our Wikivoyages we should have it undeployed from Production. Do we have a standard plan for this kind of operations?
Adding @RolandUnger as listed extension author on mediawiki.org.