We Ran Our Own Infrastructure

Another revisionist myth. SourceForge (the first forge!) wasn't "our own", nor was BitBucket (mentioned by author), or Gitorious (which was famously archived btw). or sourceware, or ...

I guess we can call ftp servers like the gnu ones "ours". But that's about it as far as where congregations of relevant projects lived.

Did some projects self-host with trac, cgit, mailman, ...etc? Yes, of course. Just like how some projects self-host today with gitea/gitlab/...etc.