1) Freeze withdrawals
2) Announce they are being frozen at some later time
3) Anyone who is powerful/influential enough to "get to you" gets their withdrawal processed
4) The rest are not dangerous enough to worry about having a hit taken out on you
I hope everyone recognizes that it's about transparency and common sense more than regulation. Sadly this will probably cascade to other exchanges as general awareness forces more people to withdraw from exchanges. Hopefully the stronger exchanges persist.
The real question everyone should be asking is: who is the counterparty to these "losing" leveraged deals?