As has been said already, but perhaps Occams razor requires to be said again : MB took one for the team.
All loose ends tied up, a guilty party blamed and punished. All legal lines of enquiry closed. Nothing more to see here.
The fine is a small price to pay to further cement the cosy relationship with a key customer, and it was only the company which plead guilty, not any individuals.
As cynical an act as I have seen for some time, but not unprecedentedly cynical.