FYI, Gitbook was made by the team behing friendco.de, which they killed without any announcement years ago.

I’m genuinely sorry the end of friendco.de impacted you. It was 12-13 years ago; the service had little usage at the time, and we probably didn’t handle the end perfectly. I don’t recall exactly, but I can assure you that the team today is more experienced.

Not really relevant here.