For one, to trade on robosats... it's the 4th most commonly accepted payment method after USDT, USDC and Revolut, leaving behind SEPA, Strike, Wise, TED and Zelle.
Excellent UX, integration. The PIX key is your phone number, and/or ID and/or email. PIX can be used via QR code. All Brazilian banks accept it. All POS accept it...