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.
It will be nice that instead of just your word you offered proof or evidence about it if you have any, in this forum without that no one will take you very seriously, besides it is not like you need to open an account with them you could always use another exchange or forget about trading.