My thought exactly…
In this country we have a law that requires goods sold to be of reasonable quality. A chain that breaks on its third outing (other than at the joining pin, or as a result of being cut too short) is clearly not of reasonable quality, and you have a right to have it repaired or replaced.
Manufacturing defects in chains are not uncommon. Why on earth would you not insist that the retailer provide you with a non-defective chain in return for your hard earned cash? Just because a chain is a wear-and-tear item, it doesn’t mean that a retailer is free to provide you with a defective item.