If your consumer business is already established in the market’s forefront, you need not worry about the fake products that the black market mass-produces. Simply because they sprawl out an interminable marketing contagion. Although it affects your sales, it will surely boost your brand positioning.
On the other hand. If your business is yet to be recognized, try to zero in with your focal strengths and hit the right market. You still don’t have the right to complain, because there might never be any dupe at all. Establish your sales as your marketability increases. Slow is always fast.