Common misconception - it's the merchant who pays for fraud and the 3% is pure bank profit. If there's a fraud transaction, the merchant has to pay the whole amount back and ends up negative the transaction fee and the chargeback fee. The banks just want you to think they're earning the 3% but actually it's pure profit.

Fraud can be managed at instant payment rails, you don't need credit card rails to manage it; fraud must be managed on any rails utilized, so it is somewhat agnostic. If you as a consumer want credit card chargeback protection insurance, push the fee onto the consumer with a surcharge to cover the cost. I believe the evidence is robust credit card rails are unnecessary in today's world, plain and simple. They are a bloated legacy holding on for relevance (and their grossly excessive margins) imho.

On fraud management:

Pix: https://www.europeanpaymentscouncil.eu/news-insights/insight...

UPI: https://ieeexplore.ieee.org/document/11063926