If any harm could come to AT&T's customers over this, then their stock price should fall. Also, as facts those email addresses aren't copyrightable. Taking the

If any harm could come to AT&T's customers over this, then their stock price should fall. Also, as facts those email addresses aren't copyrightable. Taking them and selling them for profit is what all direct mail companies legally do with phone numbers and email addresses they find. Websites without passwords are like postcards. Don't try to mandate restrictions on reading postcards, just use envelopes where needed.