Unknown crypto vulnerabilities and 51% attacks are crypto currency risks that are theoretically out there, but we mostly haven't seen play out.

At some point, someone doing AI might amass enough GPUs to do a 51% attack on Bitcoin. You're right that it destroys confidence in the coin, so if you short Bitcoin futures before the attack, you might make money.

> At some point, someone doing AI might amass enough GPUs to do a 51% attack on Bitcoin.

This is electrically impossible for Bitcoin specifically, modern ASICs exceed 3 orders of magnitude more hashes/Joule and hashrate/chip than a RTX5090 and cost $2-40 retail per chip.

People haven't mined Bitcoin on GPUs in over 10 years.