Yes, I did notice the absurd increasing quantities. I understand the view that this is irresponsible, but don't know enough about coding to be able to say whether there was a better way to test this than live on-chain. Besides, the operation was started 7 days before, there should have been plenty of time to detect this anomaly and implement a fix before the blockchain froze. I'm sorry, but I expect the STEEM blockchain to be extremely robust. After 2 years of being live it should be able to handle something as basic as negative withdrawals.