Once these coins as much as budge, price will crater before the transaction has enough confirmations to settle the deposit on any exchange with enough liquidity. Any second on exchange and the hacker is exposed to having his account frozen.

Nobody would buy OTC as they're tainted and it would be basically throwing away their money for something that is traceable and everyone is watching and reacting to further moves

Then the blockchain could be effectively forked to before the attack, invalidating the heist