I can tell you that my Steem is stuck in their wallet! No response to support tickets drives customers away.
I transferred to without checking to see that they had disabled Steem withdrawals on their site. The transactions get stuck in their Steemit account until the support team manually moves the transaction.
Calling all Witnesses I voted for: The Steemit community needs to take action against this bad actor!
RE: Poloniex and Steemit