Thats an other new problem. And as it happened once it can happen again, if no action will be taken against it. We are already facing a lot of trouble here and one of them is "Phishing", if you noticed that lately!
Many accounts were stolen and abused. Money was stolen from each account and transferred to other accounts, then to Bittrex. These are some of the accounts involved lately:
https://steemit.com/@warrentto/transfers
https://steemit.com/@gregoryoo24/transfers
