IANAeconomist but may I ask, tongue firmly in cheek, if they also only pour water into the shallow end of swimming pools to avoid contributing drownings?
Joe used to have all that code in his world-readable NFS-mounted home directory. He would just create a new directory for every idea or project. Take it with him from one computer to the next.
I hope that's preserved and one day published as e.g. the old MIT AI lab file system snapshots were.
(Robert Virding or Bjärne Däcker might well have a copy of the Prolog code to share if asked nicely.)
I made a Wiki for the Erlang community in 1999. I wrote that from scratch in Erlang. (That was the conventional way to deploy a new wiki in those days!) That landed me a job at the first Erlang startup, Bluetail.
I'm ashamed to admit that I never got the Wiki up and running again after I relocated from Australia to Sweden. (Not yet anyway, I may still have a backup copy on a hard disk somewhere...)