A "Being John Malkovich" button that lets you view nostr as that user.
that is called an npub ser
I don't think that capability has been broadly marketed. Few know!
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There is no such capability in amethyst, right? Of course you can copy the npub and create an account with it, but a Malkovich button gives you a very easy way to do it. Just to temporarily transcend into someone else's persona.