Ethereum vs Ethereum: Which Is the Ship of Theseus?

Imagine this scenario: Tom owes you money. Years later, Tom clones himself and claims the clone to be the real Tom, trying to write off all his debt to you. Tom the clone looks just like the original Tom, except for the memory. He doesn’t know you at all, let alone the debt. This would be unacceptable to you: You’d be furious and would probably want to take him to court.