What kind of uniformed user uses a YubiKey?

I supposed you could trick them by saying that the login process has changed and they need to enable WebUSB to let their YubiKey work

Uninformed users who have an informed friend looking out for them but not looking over their shoulder every single minute.

Not parent but great point, thank you.

This seems to indicate that DoD uses them. Perhaps it's mostly contractors, but there are probably some liaison-type uniformed people too:

https://www.yubico.com/about/reference-customers/department-...

The purpose of a Yubikey is to prevent users from making mistakes.

This phishing attack removes the benefit that Yubikeys provided.

Sure a smart users can decline the permission prompt. But a smart user can also simply not enter their password into phishing pages.

tqbf, pinboard, and zeynep are handing them out to journalists.

There is an enormous need for some solution resistant to users who aren't good at identifying legitimate vs phishing sites. U2F as it stands is the only practical and deployed solution to that problem. It's infuriating that chrome broke this security promise to compete with microsoft.