@nsa I just tried it. Created and enrolled a Passkey on my Mac, verified that it had transferred to my iPhone, went to Gmail and tapped to log in... and no option to use the passkey. Even if I enter my Gmail address and click "Try another way" when it asks for the password, there's no Passkey option.

Tried PayPal too, couldn't even find the option to set up a PassKey there, even though it was supposedly added in October last year.

I guess passwords will be around for a while yet...