Another benefit of legacy niche languages, such as Perl, is less ageism. Clojure is a real joy to work with. Ruby is in an interesting phase approaching niche status with correspondingly high rates.
native iOS in objective-c is getting there too, I think. I see a lot of job listings for it with surprisingly high rates considering everybody is supposed to be shifting to Swift.
The others do still have lots of Objective-C, mixed with Swift (eg. Linkedin, Reddit, etc, slowly transitioning to Swfit).
Airbnb and Uber are the only one that use mostly/exclusively Swift from the Faangmula companies. Most small Startups, that were started after 2016 use mostly/only Swift, but most large companies still do have a lot of Objective-C code.