I’m in the same boat as you - haven’t spent many brain cycles on it yet.

Mozilla Rally would have been the perfect proof-of-concept for putting that idea to use and giving it a shakedown.

Generally, Solid seems to be pretty grounded in its attempt to resolve data sharing privacy concerns.

My understanding is that the implementations would be about the same as using browser storage.

I believe developers would need to approach data access from the perspective of “an infinitely sharded document database - shards are globally-uniquely identifiable - shards are remotely distributed - shards have their own IAM - for each shard, you must register as an authorized user and authenticate to access remote data”