There's no need for yubikeys. we have the ultimate key, our phones. Most modern phones have SE(Secure Element) or virtualized secure zone(ARM Trustzone) which

There's no need for yubikeys. we have the ultimate key, our phones. Most modern phones have SE(Secure Element) or virtualized secure zone(ARM Trustzone) which can act as de-facto key. Google already uses it to great success(most people are clueless to that though)