Prudent approach not to rely on their wallet. I did the same before. Now I was mining to their wallet just to collect some referral fees. OK, it is lost now but no big deal, fortunately.
I believe that they have real issues. I know, the word used is believe and not know :)
What are you using now for a mining pool?
Their profits are enough to build the most protected site ever with any costs. but they didn't and its their problem not people problem.
Currently still trying some mining pools. it very hard to reach a miner like nicehash.
From their explanation the thieves managed to infiltrate one of their office computers. A backdoor attack, so to say ...