Maybe a better example would be the pot industry. Pot is blatantly illegal at the federal level. So everyone currently running a dispensary is theoretically operating fraudulently with their business partners.
Does that mean they have a duty to their own business partners or customers or investors to shut down their own business?
They are not operating fraudulently. Their customers are buying and getting marijuana. Their investors surely know the risks as well.
If we're looking for an analogy in this space, I think it's more like snake oil. So imagine a company started selling a new "nutritional supplement" or "herbal blend" that helped with anxiety. But it turned out the secret ingredient was weed. That would be a fraud on investors and they could well get charged for that on top of the base drug charges.
Does that mean they have a duty to their own business partners or customers or investors to shut down their own business?