This is very cool in terms of security principles (no email that can be used to track you by default, mandatory 2FA, mandatory SPF for emails). The mandatory i

This is very cool in terms of security principles (no email that can be used to track you by default, mandatory 2FA, mandatory SPF for emails). The mandatory inclusion if you use third party SSO already (smart I think as otherwise FB and Google would probably start paying developers not to include it) aside, this will probably get a lot of uptake for apps that dont use SSO. Apps that people mainly use on mobile devices and TV's would benefit a lot from this (as these devices arent good for typing in complex passwords). Additionally larger companies would be concerned about letting Google or FB sell their user list to competitors for targeting. Apple already has all this information, so nothing is lost by enabling SSO.