Why do you think they won't get their funds back incase there is a come back? They have the details of the customers who registered with them and those who have funds to withdraw. Customers also have prove of playing with them so it won't be a difficult thing to identify those who had account with them. However, it may be a slow process that will take time and some you had issues with the accounts earlier might find it difficult to make a clarification with them but people will get funds back if they did come back.