It seems like it could pair really nicely with the work that Ink&Switch (https://www.inkandswitch.com/local-first) is doing around local-first app development and Automerge (https://github.com/automerge/automerge) as a good way to keep disparate private copies of work in sync.
I have no connection to Ink&Switch, other than appreciating their work.
https://github.com/yjs/yjs
https://github.com/yjs/yjs