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
What do you mean with that?
Those coins belong to users, or do you mean they invested in Ethereum, if so why are you assuming they didn't made profit already?