Also don't forget what happened to Usenet. At first it wasn't archived anywhere (disk space was expensive then). That was ok, people treated Usenet discussion

Also don't forget what happened to Usenet. At first it wasn't archived anywhere (disk space was expensive then). That was ok, people treated Usenet discussions as ephemeral and said things expecting them to not be dug up later. Then a nonprofit called Deja News started archiving them, causing some limited consternation, but it was a useful resource and offered an opt out to people who didn't want their stuff saved, so fine. People came to rely on Deja News, and... Google acquired it, and it became part of Google Groups, which got worse and worse to the point of now being useless and irrelevant. Usenet is not completely dead, but it's a shadow of what it once was. Certainly revivals should keep the strong and weak spots of the past in mind.