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Because they aren't physically equivalent. QM IS Copenhagen. Other "interpretations" (like pilot wave) result from the desire to bring back the classical view of the world and are either completely new theory, different than QM or finally turn out to be some version of Copenhagen
Also What is your support for saying all interpretations are equivalent to Copenhagen? If they’re equivalent, then how on earth could you call it wrong, assuming you subscribe to Copenhagen?
Not all. The correct ones are equivalent 
Some "interpretations" are just rephrasings of Copenhagen. Pilot wave theory definitely DOES NOT contain the same physical content as the original QM defined by Heisenberg, Bohr, Pauli, Born et al and is not correct.
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