Poloniex is my first exchange.Well that they have updates,but I think that their time has passed.In my opinion Bitmax is the leader of margin trading.Although as they say never say never.Perhaps the management of the exchange will be able to somehow attract the target audience.
It will be hard to gain back their customer, they will need to implement new technology and technique to attract investors and traders to use it again. Even there is BNB hacked today, users might not transfer in poloniex again.