There are two different things -
1. People who earned from cancellation activity on Ecom sites. It clear intention of Fraud
2. Payment of CC bills from portal through eligible MCCs. Irrespective of which bill you are paying, bank get MDR as per MCC so if they are giving you rewards points against eligible MCCs then they are not at loss at least as per their business strategy.
People falling under 1 have to worry. For genuine transactions bank has to face brunt and it's not customer issue at all. 2nd category People doesn't need to worry as bank clearly mention in T&Cs then MCC get assigned by Acquiring banks and not card issuers. And they are earning from respective MCCs
1. People who earned from cancellation activity on Ecom sites. It clear intention of Fraud
2. Payment of CC bills from portal through eligible MCCs. Irrespective of which bill you are paying, bank get MDR as per MCC so if they are giving you rewards points against eligible MCCs then they are not at loss at least as per their business strategy.
People falling under 1 have to worry. For genuine transactions bank has to face brunt and it's not customer issue at all. 2nd category People doesn't need to worry as bank clearly mention in T&Cs then MCC get assigned by Acquiring banks and not card issuers. And they are earning from respective MCCs