Maybe we hear about it because, it's right in the US' backyard and the biggest country there is Brazil from which pix comes from. All these payment systems threaten visa and Mastercard but pix is the largest in the US' backyard because the country it comes from, Brazil, is the largest there.
And it's also government run, dun dun dun. The us hates anything that is government run. That's why they hate china and communists and socialism so much.
Evidence of high levels of power political pressure - US latest 25% tariff pressure came out explicitly around this topic - https://www.reuters.com/business/finance/brazil-us-clash-ove...
With visa and Mastercard you pay transaction fees and rent for a card terminal aka card reader, which are lower or non existent with these homegrown or local P2P payment systems. Outside western developed countries aka the US and the richest European countries like France, Germany, that's enough to stop using visa and Mastercard.
Took me 2 visit to fully setup. First visit to India, they are like I need a debit card. I hate debit cards, but I got it. Which got delivered to my US address. When I got there, they are like I need Indian number and I have to do KYC to update. 3rd visit, I got everything working. At that point, they also let you use US number. But I wouldn't recommend US number as roaming is expensive if you have ATT.
You also have to disable developer mode and can't root the device.