As a customer, if I can't do a chargeback in the case where you don't provide the advertised services, I simply won't do business with you and will go to one of your competitors.
With UPI, customers can raise a dispute and get their money back. As far as I know, the fee charged by some payment processors for UPI disputes is much lower than the fee charged for card disputes, or is non-existant, depending on the stage at which the dispute is resolved.
