Glassnode recently released interesting report about Bitcoin's Quantum-Exposed supply.
They tried to measure the number of coins to be affected by future quantum attacks, and it's really a big number.
More than 30% of Bitcoin already has public key exposed on-chain, making them vulnerable to quantum attacks!
Centralized exchanges account for 40% of operationally exposed Bitcoin!

It's interesting that even taproot addresses are considered unsafe because keys are exposed in public.

You can read the full Glassnode report here:
https://insights.glassnode.com/measuring-bitcoins-quantum-exposed-supply/