Let us not neglect the WildCat BBS....
I heard of Modem Butterfly BBS. I was taking C programming class in early 90’s our prof said we could e-mail our assignments via Compuserve, he didn’t know our computer lab was connected to wide area network (Internet). In the Unix command line I used to snoop pressing w to see what other users were doing and try anything, learned to how to telnet, irc chat, gopher, ftp download stuff all over the place, at home I dial in to the university lab to explore more. Lots of users were online like 24x7.