Never keep any funds in exchange wallets, unless you're trading each day and are willing to consider your funds lost at all times!
But this is indeed worrying news, luckily I'm not using Poloniex. Wonder why are they not taking the threat seriously?
If your strategic plan involves an exit scam, you don't do much to improve what you got. Poloniex doesn't add new alts, removed troll box to respond to support tickets, but tickets continue without response for months. While the crypto community is active on twitter, they barely have presence on social media. Picture doesn't look good