I have some months ago messed around with writing a plugin that allows collaborative editing in some sense.

Basically, I realized that my notes are in nextcloud and nextcloud already has a collaborative markdown editor based on Y.js.

So my goal was to open a file from nextcloud in obsidian as a participant to the collaborative editor session of that file. Right now I'm a bit busy with exams but it was working pretty well and I may finish it sometime.