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I think comparing NFC to a USB port is a little glib. To make it more comparable, I would say there is no more risk from NFC than letting a stranger connect to a USB port. Admittedly, you would probably notice the cable, whereas is it a little harder to get a visual on radio communication. The short range of NFC does minimize the risk but minimal does not equal zero. For example, ATMs are relatively safe, but skimmers do exist. Of course NFC is only an attack vector, but it potentially could allow one to reach the actual attack surface, such as the browser.