Because you still have to mine them, ton by ton, you can't just tow one of these to earth, put a parachute on it and done. Whereas if a lab right now today had a number of quantum machines running 2k logical qubits and 1b gates, Bitcoin would be game over in a week. As in game truly over. Yeah we're nowhere near, but we are at 100 logical qubits and advances in error-correction means there is a clear theoretical path to billions of gates. So it's not crazy pills. Different threat types.