I doubt these clowns know this, but a lot of retail banks offer the ability to withdraw funds in another major western currency, like EUR/CAN/MX$/GBP. though I expect there are single transaction limits for individuals in a given period and the bank probably has a policy where they can revoke providing that service. but if you were the first panicking asshole, that would be a short term IRL move.

someone looking to exit the dollar could also transfer to an investment account and purchase some some assets/securities. like that guy who keeps buying truth social shares lol, though for a dollar run you would want some foreign assets which is going to take days to resolve.

I am pretty sure this is someone peddling peepeecoin or doodoocoin, which one could also do very fast because it's a scam. and scams work better when it's a short fuse. act now! FOMO!