Where better for the coming anti-Facebook backlash to be born?
Second, and more important: finally, an un-obnoxious, non-political use for fact-checking.
Who's going to build crowd-sourced Snopes for ChatGPT?
I don't recall BBS systems requiring email for registration. Most of the ones I went to a few years later (early 90s) didn't require registration at all.
The easiest way to have access to email and the internet in the 80s was via a university shell account or certain larger industry and defense employers.
That was a relic of the DEC PDP-10 / TOPS-10 architecture that Compuserve was built upon.
It was only after 1995 or so with the web starting to develop and, subsequently, dial-up ISPs exploding that BBSs went in to that rapid decline.
The BBS Documentary has a nice segment on this - especially poignant if you lived through it.