> The "investigations" are political posturing. PIX is not "unfair business practice"

Agree

> its a modern, cheap, state-of-the-art payments system that is better than what private businesses like MasterCard and Visa are willing to offer. I can think of plenty of ways they could offer actual value to customers so they can still be relevant.

This is a common misconception. Pix is a form of bank transfer, not a full blown payment infra like MC/Visa. They are different products, Pix doesn't make credit cards irrelevant.

Per BCB statistics: In 2020, before Pix implementation, credit cards accounted for 2% of the monthly BRL volume transacted (~ 200M BRL)

As of 2025Q4: credit cards still accounted .... for the same 2% (~ 800M BRL)

The main question is: historically, why haven't credit cards been more popular in Brazil, even before Pix?

You'll find your answer looking at structural issues (high interest, delinquency rates, bad credit offerings ...), not technical concerns