It verifies the "realness" of the account, so everyone claiming that they need user's real email address for "fraud detection" can't argue that nonsense anymore. We all know that argument was just a cover for "we want to be able to spam our users with impunity", but this specifically addresses that argument just to be sure.
Run a site that allows/displays user submitted content and you'll likely change your mind about that being a cover or bogus argument.
And very few apps (at least of what I use) that have 3rd party auth have features where user content is displayed to others.
If you watch the presentation or read the transcript, you'll hear that they already do a bunch of fraud prevention. I'm going to go out on a limb and say Apple is doing much more anti-fraud/fake account work that most others are able to.
You get an email address you can contact them through.
The only reason they want a user’s real address is because they want an address the user cant stop them from spamming.
There is literally no other reason.
Unsubscribe and report to spam doesn't exist in our world, anymore?
Deleting the anonymous redirect address they’ve been given requires no such cooperation.
Also, I think most users anyway use a secondary or "throwaway" mail account to sign up to various websites that are not critical to them. This problem is largely already solved.
If you watch the presentation or read the transcript, they explicitly say that they're doing fraud/spam account prevention.
Do you really think you're doing more fraud/spam detection and prevention work than apple?
But also any argument that the makes spam harder to block also applies to Facebook or google logins - I can’t imagine spammers are using real email addresses with those services.
The only people this changes the experience for are actual users. Spammers already have a huge array of options to get “real email addresses”.