Poloniex gave all my ETC to people taking my microloans, but only did it 3! days after the hardfork and without any prior announcement, unlike other exchanges, which closed all positions before the hardfork. I don't have any strong opinion about ETC, but I do think that the exchange that has the highest trading volume in ETC and fucked me over can not be trusted which is why I'm steering clear of ETC for now.