I’ll chip in as john.<reasonably common surname>@icloud.com.

I still get email from AT&T for John Notreallyme who I believe is in his 80s and lives in Montana. He signed up in-store and I got emailed all of his details.

I got the first email that asked me to confirm my email address. Obviously I did not do that.

It makes no difference. I don’t know why they bothered.