Not a sysop but I’m frequently on Particles BBS with my old C64. I’m also a contributor to the BBS-like terminal client neonmodem, used for browsing Lemmy, and other social platforms, with a BBS like feel.
There’s definitely been a resurgence in “old” Internet tech. I’ve been on sdf.org for a while now and really got to enjoy the “small web” movement as it took off over the last couple of years. First through gopher and then through Gemini and most recently through Superhighway84, a distributed/decentralized Usenet-like application/protocol.