They probably got some investors to generate some trading volume on their platform, just to attract more people... I sincerely hope they get back on their feet stronger than before... keeping my fingers crossed.
I do think they got hired wealthy traders to give the volume a boost but in the end they have proven to be not very carefull with customers funds which is why I think they will not get back to their old level. Especially since all of their customers lost money.
Since all of their customers lost money with them when the hack occurred they should reimburse them if they want to gain back the trust they lost.