I guess you haven't read their terms about delisting, I quoted it for you:
The currency delisting procedure will be performed by the exchange only with a prior announcement of at least 14 days before the actual delisting of the market. A notification by newsletter will be sent to all user e-mails (all users are subscribed to the newsletter by default), Twitter, Chat and on the main trading page ("Important News" section). Markets will also be highlighted with a red color to let users know that the market involving the currency is planned to be removed from the exchange. This gives users ample time to trade or withdraw currencies before they are delisted. Balances cannot be recovered after a coin is delisted. Wallets can be given an extended grace period for withdrawals if server performance is not affected. Coin can also be delisted without previous notice in case of broken blockchain which a coin developer is refusing to fix.