I think maybe if everybody selling something didn’t make the audacious assumption that I’m also providing my email address because I really want you to spam the shit out of me with all of your announcements and promotions, it wouldn’t have to come to this.

I certainly don’t want anybody I buy from having my Apple ID email, and they should not assume that just because it is a user identifier, that does not mean it’s even used for email. Some retailers do this with things like paypal, and actually overwrite the supplied email address with the one from paypal. Really annoying.

The correct pattern is to ask the user for the email address that they would like you to have. And preferably, never send email to it again.