Decentral Bank paused the smart contract upon noticing the decimal point bug, and burned the excess $10 trillion supply to restore the proper amount of stablecoins in circulation.
Luckily for them, they were able to pause the contract before anyone exploited it in ways that were not so easily rectified. The ability to receive $1 trillion in USN out of $1 could have easily been used to drain the USN/USDT liquidity pool.