Point # 6 in the "Terms of Service" provided by Steemit:
6. Assumption of Risk, Limitations on Liability & Indemnity6.1. You accept and acknowledge that there are risks associated with utilizing an Internet- based STEEM account service including, but not limited to, the risk of failure of hardware, software and Internet connections, the risk of malicious software introduction, and the risk that third parties may obtain unauthorized access to information stored within your Account, including, but not limited to your Private Key (as defined below at 10.2.). You accept and acknowledge that Steemit will not be responsible for any communication failures, disruptions, errors, distortions or delays you may experience when using the Services, however caused.
They are BLATANTLY stating that they accept no responsibility for hacking of their website or the code within.