It seems that all of them were built for recursive archiving in the early '00s for personal storage (so they were programs literally installed on computers rath

It seems that all of them were built for recursive archiving in the early '00s for personal storage (so they were programs literally installed on computers rather than a specific group). Probably a legacy thing (considering at that time Wikipedia literally runs on a single server). I found a robots.txt file that even list a greater variety of said software: https://www.iatse.com/robots.txt https://www.iatse.com/robots.txt