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> Email was one's passport and identity.

Email is not an identity. Most people have multiple email addresses, and some people share some addresses.

A person can have multiple identities, and not all identities are associated with specific people.

Email is not a person's unique ID, although sometimes it's used to serve that purpose. The ID layer of internet is not established yet. I'm not sure if it's possible in a decentralized system. Centralized management may be necessary.

Agree, but "identity" and "unique ID for a person" are two different concepts.

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