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.

Fair point, though I have honestly no idea of the percentage of board directors that have committed white collar crime.

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.