Nice find! CM is like an early piece of platform in the digital communications evolution. There're similarities between CM and mammoths. Both of them are thrilling to think about, valuable to understand their contexts and evolutions, and I would wish to have seen one in real life.
Is there anything similarly anonymous with a similar culture on the light or dark web? I guess there is/was Usenet, but that seems to have dried up somewhat. IRC is anonymous, but doesn't have the memory aspect.