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Internet Archive Was Exposing User Email Addresses for Years Before Recent Breach
(theintercept.com)
Information about data breaches, data leaks, ransomware attacks, and other related stories.
Every submission to the archive has metadata associated with it, one of those pieces of metadata is the email of the uploader. You can look it up, search by it, etc. I question that claim from the article. I've never seen IA claim this information isn't publicly available.