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Why hasn't Alipay completely replaced Visa and Mastercard in US? Everyone has a smartphone to scan a QR code.

I struggle to understand how is this relevant. Alipay is closer to paypal than to VISA/MC

Alipay the wallet app is closer to PayPal. But they also have Alipay+ which connects a lot of different wallets and banks: https://www.alipayplus.com/mobile-payment-provider-list/

have you not seen what happened to tiktok?