This is useful for those who don't have bank accounts. On 19th Dec 2023 I opened my 1st bank account of life before that I used Paytm wallet.
Problem with wallet was if wallet is of Paytm it can only scan Paytm QR code and same goes with other wallets like phonepe, mobiquik, payzapp etc.
But after launch of wallet upi U can use wallet as upi that means you can scan any qr u want.