Committing crimes without getting caught is also how you can become a board director. There are other ways too obviously. Mostly wage theft, anti competitive crimes or some embezzlement. The kind of crimes privileged people would commit.
It's zero or near zero. Committing crimes generally bars one from being a director, especially public companies. White collar crime sentences generally preclude serving on any board until their dues are paid to society. Even personal bankruptcy can preclude being a director.