Poloniex is exchanging ETH. Anyway, they are fucked now. They own like 10% from ETH. LOL
If ETH goes down, Poloniex is going after them too; so, be careful where you keep your funds

it seams Kraken is fucked too. they have "millions" worth of ETH
Always assume that everyone and everybody is trying to scam you, that way you will be lessen the risk of being scammed. Therefore be careful always. It is not shocking that Poloniex got hacked anything in our modern time is vulnerable to hacking.