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15M Trello accounts have been leaked
(lemy.lol)
This is a most excellent place for technology news and articles.
I think it's reasonable that you chose that title based on the email header, and I also think it's very irresponsible of haveibeenpwned to send out an email with that subject line. They absolutely should know better.
It's a breach. Name and username should not be publically accessible using the email address alone.