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There's a comment below, "I just signed up and it’s super fast. Download the app, put in your name, allow Bluetooth. No email, no password, nothing."

I suppose getting special "NFC card" permissions when they already struggled to get the app in the store would have been a bit much.

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Interesting. Android has a Nearby Connections API[0] which "uses a combination of Bluetooth, BLE, and Wi-Fi technologies" and appears to allow interoperability between Android and Apple devices, and Apple has a Nearby Interaction[1] which "use[s] the high-frequency capabilities of the UWB chip" but is restricted to Apple devices, so I guess it could be one of those rather than NFC.

[0] https://developers.google.com/nearby/connections/overview

[1] https://developer.apple.com/documentation/nearbyinteraction

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