MUSHes and MOOs are virtual pubs that aren't as fashionable any more as they once were. (Most MUSH-oriented apps are glorified telnet clients, and tend to reproduce the same aesthetics and design flaws/idiosyncrasies.) Real life pubs are real-time, and MUSHes offer a good balance of real-time, networked interaction and persistent objects. This project doesn't handle the real-time aspect and is less like a pub than a blog with a wiki-like editing experience.
I'm convinced that with all the chat apps that are popping up, the Slack killer will be the first one to reinvent the MUSH by bolting its most notable features onto the "chat" space.
(When Keybase was still a thing, I thought they might do it by introducing "bot workers"—chat bots implemented in a script bundle that's managed and executed in the client itself—like a browser add-on, but based on Service Workers a la Cloudflare Workers.)