Not so simple. QC are getting interesting though. But I doubt we will see a hack by IBM or Google or Universities. It would still be illegal and we know how to find out who did it. Chain analytics may take time, but we will figure it out. Even coin washers can be unravelled. And any off boarding to fiat will get you. I doubt any eastern europe fags will have the ability to hack with a QC. China maybe but muddy the waters. Post quantum cryptographic signatures will make it further difficult to hack newer chains.