Just published: https://medium.com/@HjalmarPeters/how-poloniex-enriches-itself-by-screwing-its-customers-2002b61dced0

"Conclusion:
Poloniex takes the ETC of its customers hostage in order to generate artificial low prices at its domestic markets. It then buys cheap ETC at its own markets and resells them on other cryptocurrency exchanges at the regular, higher price. Yesterday (May 5) alone, Poloniex netted at least half a million USD this way. This profit comes at the expense of Poloniex’s customers."