There’s not significant usable quantum computer “hardware”/“power” in existence. It’s still largely a theoretical thing (although we are getting much closer lately).

The most likely use for it while capacity is limited (assuming they secretly have enough to do anything with) would be for espionage: cracking many defacto standard encryption algorithms that are in use the world over.

On top of all that, Betteridge’s law.

His IQ is higher than 1.