Google Poloniex lawsuit. Tons of insider trading, bots, other unfair practices. They're robbing us blind. Remember there are no regulations on these exchanges, so ignore this warning at your own risk.
But every user already agreed with the risk. There is no regulation on polo, and insurance to give a guarantee for the users.
If you play on polo it seems like you're playing in the grey area. Too many unfair practices in polo. The possibility of polo will be turned to the scam site is always be there. This time all of the transaction gets blocked by him.
His DDOS looks very odd in my mind. We are doing a trade at our own risk.