Which websites support passwordless authentication (FIDO2 WebAuth)? Microsoft and eBay, AFAIK. The rest may use U2F as a second factor not the only one. Also,

Which websites support passwordless authentication (FIDO2 WebAuth)? Microsoft and eBay, AFAIK. The rest may use U2F as a second factor not the only one. Also, for recovery you need multiple phones, and you need the websites to support that. It will probably take a while for websites to support this, and even then people are not going to buy and register several phones.