Probably because they lost more money than most people will see in their lifetime and were largely unaffected by it.
The people he's ripping off are, if you trace the trail far enough, the taxpayers of the world. His use of freeports was a novel approach to money laundering by way of art sales.
The use of freeports seems orthogonal to the fraud allegations outlined. Can you explain how they are related?
Bouvier was a major actor in and a proponent of the establishment of freeports. The affair tells you a lot about what the art world has become and how the richest évadés the obligations which befell the normal citizen.