Why you should begin using Sign in with Apple
Apple has published a lot of information explaining how its newly introduced Sign in With Apple service solves a problem most of us didn’t know existed – something many of us would very much like to solve.
Who watches the watchmen?
The issue: Most social sign-in services act a little like user-tracking honey pots: You come to use a website or service and stay because the people providing the authorization use that moment to gather even more information about what you do.
What happens is that the persistent identity used by those services can be combined with other data to identify where you go, what you look for and more. It sounds innocuous enough, but over time the individual profiles grow, and can be leaked, stolen or sold – and you don’t know by whom or to whom.
Source: Enterprise Applications