Hacker News Reader

According to them, it's because "there isn't room on the USB-C devices for an NFC antenna": https://twitter.com/i/web/status/1044254654366769152

How big is the NFC antenna?! The size difference of 5C and 5C nano is pretty big but if it still can't fit the antenna then it must be huge

The YubiKey 5C is really quite small in comparison to the normal YubiKey 5.