The NIST has already recommended 4 quantum-resistant encryption algorithms and US agencies are currently upgrading their systems... so I think national security agencies should be relatively safe. I imagine the financial sector has more money to play with than government agencies, but I'm not sure how far along they are with upgrading to the NIST-endorsed algorithms... but you're right, quantum-hackers might only need a couple of financial institutions to be vulnerable to be more profitable than Bitcoin. I guess the other issue with Bitcoin is that the price would drop dramatically if they were to flood the market so the profit might not be as vast.
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