Totally sounded like embezzlement to me too. Somebody at Synapse making the records intentionally unreconcilable/vague somewhere in the accounting chain so that they could claim some portion of that as their own. I guess it could be gross incompetence, but the embezzlement story actually seems more plausible in this scenario, especially given the animosity between the corporate parties involved. Maybe an incompetent CEO at Synapse who really believes the vague numbers they were given that doesn't line up well with the other banks' own records. The fact that there was a lottery system baked in that grabbed from a pool of "cash winnings" that was financed by the interest rates of deposits at other banks just adds to the opportunities for embezzlement. An employee "gets lucky" with the gambling setup a few times with a pot that is non-attributable, says more money needs to get transferred to the pot because somebody won a payout, etc

The current lack of collaboration between the banks makes it seem like they believe this too. The ones that had funds paid out already so they could avoid holding the bag. Whereas Evolve is the last one standing when the music stopped and is now taking the reputation hit.

In finance the usual rule is flipped, and you should never attribute to incompetence that which can be explained by greed.