You have two scenarios:
A team which has only one job, being the middle man in transaction and securing the funds to be blind for several years while money was being stolen by a hack.
or
Mark took stole all the coins and ran away.
This title is correct, and I'll support it anytime.
I'm pretty sure there was no "team". All along it's just been Mark, with his only employees being AML and customer support staff.
Which makes this even worse.