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The storage of the data is trivial. The part that's not trivial is the manipulation of that data - filtering the data so the user only sees what they are approved to see, syncing the data so that changes made on one system aren't overwritten by changes made on another system (unless they are supposed to), importing data purchased from other users, selling our own creations to be imported into other player's Realms (without sending them the parts of our data we're not selling), etc. That is all server-side code which represents what the cloud is doing for us. If it were only about storage I doubt they'd have bothered because the other services you list already do that - but it's really about how that stored data can be manipulated for us by their servers.
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