For one thing, I doubt anyone with the resources to build a quantum computer would be the least bit interested in my 3.462 Ethereum.

We can only hope that the natural urge to develop for one's own advancement outpaces the development by those coerced into cooperation.

I was also under the impression that the code breakers at Bletchley Park were moderately successful until an actual Enigma machine was acquired by the Allies and they were able to study its inner workings.