I think it's better for you to consider punishing managers for losing games intentionally in national leagues which affect other managers' final standings. This guy did not make any harm to other users, just to himself and he doesn't deserve to be punished.
Before we congratulate our new B3 winner, there are some B3 related changes to announce. Effective immediately, all B3 games will be played at a set enthusiasm of 12. No longer will smaller nation teams suffer an enthusiasm disadvantage due to shorter cup runs while larger nation teams will no longer be at the disadvantage of having to better manage their enthusiasm against tougher competition. The B3 is a tournament where the best teams in the world face off and we want them to be on a level playing field. May the best team win!