[@Sanity43217] They're pirates. You think they really listen to what people tell them to do? XD 

Officially, they do not raid merchant ships as part of the treaty they signed. They simply go in search of treasure and artifacts so they can get rich. 

Unofficially, they're pirates, and they do what they want as long as they don't get caught. 

Edit because I remembered a thing: More than that, this rule only applies to pirates who join The Consortium. There are still pirates who don't affiliate themselves with that organization.