TL; DR FanDuel was sold for less than its liquidation preference, so common stock holders got nothing.
I'm curious - what happens to the current set of employees in this situation? Presumably some of them have vested stock, and it just got zeroed out. If there's ever a good time to ragequit, this seems like the appropriate hour.
If the value of the company of the company is less than the value of liquidation preferences, then the employees' stock is worth ~zero. Its value doesn't suddenly go to zero at the moment a transaction takes place. The transaction happens at that price because that's the value.