Brazil has an insane level of financial fraud and tax evasion. Pix mitigates some of that, but at the cost of privacy - something that Brazilians do not care too much about.
Pix does not substantially changes the tax evasion problem as that is mostly a problem with higher earners and small/medium business who evade tax using cash payment, convoluted setups of companies and "laranjas" (our slang for someone borrowing the name to do something for someone else, the scapegoat) as well as "non cash" transactions.
Pix mostly replaces and eats on credit card transactions that were done for the convenience aspect and no the credit aspect. As well as allow a whole new part of the country to accept electronic payments, and although that would increase tax revenue from business it also substantially increase their revenue since there is no x% from card processors and don't require special rented/bought equipment.
But is true. I am a Brazilian who lives in Sweden and there are multiple banks here that have blank bans on transfers from/to Brazilian banks due to the amount of fraud and money laundering and lax KYC controls. It is simply too much work for the banks here to vet those transactions and they decided just to refrain from doing it.
He's not wrong though. "If you have nothing to hide, you have nothing to fear" is a popular saying here. People who lived under a military dictatorship not even half a century ago will actually utter those words.
