In all fairness, there was also a lot of commercial BBS activity around that same period--or at most a couple of years later: Compuserve, Delphi, AOL. And some of the bigger non-corporate BBSs became commercial as well (and later became some of the early regional ISPs).

It's interesting stuff though. I suspect that relatively little has been saved from the BBS days in part because it was so decentralized--although I'm not aware of Compuserve and the like ever having made archives public either. The situation is a bit better on the early Internet side but even there Usenet archives are incomplete--and were very nearly even more incomplete.