The goal with ChargeBack.cc is to divert unhappy customers away from the traditional chargeback system and into direct contact with their merchant. It is backed by sending unresolved disputes through the banks, but if we get to that stage I consider the chargeback failed on our behalf.
The banks will put you in direct contact with the merchant. From a merchant's perspective, your service is just another unnecessary middleman to deal with. The damage you're doing is advertising the chargeback feature. You are encouraging users to initiate chargebacks (whether through your service or not), which is not a good thing.