"DMail’s hypothetical blockchain-based datastore will choke, roll over, and die, long long long before it scales to that size."
Don't store large amounts of data on the blockchain. :-) Store it in a distributed datastore. Just put the user's information and a pointer to the datastore on the blockchain.
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Don't store large amounts of data on the blockchain. :-) Store it in a distributed datastore. Just put the user's information and a pointer to the datastore on the blockchain.