that was my same thought as well , they closed down and blamed it on a hacker. I also had a zero balance. The site would have fixed the hack by now i would assume.
If they are hacked and they haven't recovered the site back, this is probably an exit scam so they can divert the attention to themselves into another outside entity so they don't bear any responsibility for the lost funds of the players, remember to always find the right site and go for the ones that are established on this forum to have your money safer.