Do they even exist? I believe these countries that you are thinking of being "serious" is actually non-existent. Come to think of it, if there's a business that wants to conduct in your country and you know you will both benefit from that kind of business, wont you allow the business to operate? You have the full control whether you can allow or remove them from your country if it comes to a time when the business gone illegal, but as long as the business is legal and right, there's no point in blocking it 🙂