Is it possible to share data saved by an app across all user accounts that have the application?
This is not a supported operation; the datastore API is really meant as a synced substitute for local storage, not as a way to access a single shared database.
UPDATE: Datastore sharing is now supported (see other answer). But the intended sharing model is more that you share a specific datastore with some of your friends/colleagues/etc., not across all accounts -- the latter is possible but it may not scale to millions of users.
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