Hi @kapv89,
@braden put it nicely. You can scale your application horizontally using any pubsub server. y-redis is just one approach. I’m planning to rework the current y-redis implementation which is why the section is still unfinished.
Ueberdosis is working on a really nice alternative backend for Yjs that scales using y-redis. You should follow their progress. https://next.tiptap.dev/guide/collaborative-editing#our-plug--play-collaboration-backend
Unfortunately, there is no plug-n-play indefinitely scalable backend for Yjs yet. But all the tools are there to build it yourself.
Cheers,
Kevin