Amazing work. I think there's a whole host of apps that just store some small amount of data for each user that could work entirely on something like this.

Some nice things:

- Anyone can host their own Matrix homeserver, which can then sync its data within a federation, allowing users pretty fine-grained control over what data they share and with whom.

- Add end-to-end encryption, and it becomes even better: data stored somewhere in the cloud (i.e. the user doesn't have to manage a server), but the server knows almost nothing about what you've stored aside from some metadata.