Currently I don't know with the new update about poloniex exchange is safe or not after more than two years not use yet with this exchange, firstly I used with this exchange and running well with deposit and withdrawing fund such as the other exchange and looking forward Kucoin when listing premier coins I move all assets from Poloniex to Kucoin.
Latest update, the Tron founder Justin Sun acquisition with Poloniex exchange, its will bring positive viewed but can't guarantee for long term investment and hold coins in this exchange will be secure. For short term trader maybe its not bad ideas using this exchange but check with their telegram channel discussion group are Poloniex have positive or negative reviewed when depositing or withdrawing fund.