Multiplayer editor without a sync server over ATProto, working demo https://jakelazaroff.com/words/building-more-resilient-local-first-software-with-atproto/

yeah makes perfect sense, also why I jumped at ATProto once I understood it. Its storage system mediator that retains data control to the data owner. So you get networked services but without lock-in. Big drawback is everything is public, they have an encryption workaround in the works (spaces), but apps can collaberate better if everything is public anyway so I don't even see that as a negative.

Nice! Another ATProto apps that doesn't require BlueSky infrastructure. And yet, comparing to my own sync setup for local-first work (which is files managed by SyncThing), I note some loss of control: access authorization is at the app level, not per-use. I cannot grant read-only access to this editor to one document, and read-write access to another. With files, that's straightforward.

Regarding private data in atproto, there's a more recent blog post by Bluesky's Head of Protocol: https://dholms.leaflet.pub/3meluqcwky22a (via)