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I agree that this won't make much practical difference.

I think it depends on the chargeback reason code. If the chargeback was due to fraudulent reasons, merchants have very little chance of having it reversed. Now, they may be able to fight it and win based on procedural reasons relating to the chargeback dispute process. Not something worth doing though for most merchants.

Sometimes, its more costly in time to fight a chargeback than the fee that is imposed. Many merchants just let it go and eat the costs.