For those who only provide web services, we generally call it a forum. This is the difference between a simple BBS and a forum.
……
Generally speaking, key universities in China, such as Tsinghua, Peking University, Fudan University and Zhejiang University, have provided BBS with telnet connection.
……
Starseeker, moderator of BBS forum of memoirs of a geisha.
=================================================
BBS is the abbreviation of bulletin board System. By running the service software on the computer, it allows users to dial-up through telephone modems or the Internet using terminal programs, and perform functions such as downloading data or programs, uploading data, reading news and exchanging messages with other users. Many BBS are amateur maintained by webmasters (usually called SYSOP-SYStem OPerator) and also provide paid services.
At present, BBS sometimes refers to online forums or online communities.
Network forum, or information version or discussion version, is a program that provides online discussion. It is a modern version of BBS, which was popularized by newsgroups in 1980 and 1990. (Explanation in Wikipedia)