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.
A site that with the volume of transactions that poloniex is having cannot but have some deficiciencies and even some law suits against them but the issue is that even with the myriad of court cases against them is not a confirmation that they are guilty without the proclamation of a court of competent jurisdiction and if their activities is not OK with me, I believe I am at liberty to try other exchange sites that meets my need.