Same reason the US is going after Pix in Brazil. The world is decoupling from the US and the US is going to try to flex against it as it continues. Dollar dominance and the “exorbitant privilege” continue to erode (with the acceleration self inflicted). Also shrinks the TAM of these private US firms to only the US versus the world.
https://en.wikipedia.org/wiki/Exorbitant_privilege
The interesting thing is that Visa's payment rails are cheaper than Pix. Pix charges businesses 0.22% to 0.33% while the Visa network rate is only 0.10% to 0.15% per transaction.
The main thing that makes card transactions more expensive is the merchant bank assuming chargeback risk, but that's because card payments are an entirely different transaction type. Pix is digital cash. You typically cannot get refunded for any reason. Cards are not digital cash. You can get refunded for fraud and unauthorized transactions.
Something like Pix is a great blueprint for the future imo.
I don’t want international private companies controlling payments, better have my own elected government manage it.