At the end of the day I value journalism of this kind which is in part investigative and doesn't, to my uneducated eyes, appear to have any personal cost. I'm not sure how interesting it was in this case, but in general "wasn't supposed to be published" is about a fraction of the rationale that needs to be there for a media organisation not to publish.
At the end of the day, TC broke a story here and leaked something Twitter didn't want out in the open. They took a hit on traffic and, by extension, to their exposure which as a media company presumably is a measure that affects revenue. Therefore Twitter deprived TC of revenue as punishment for publishing information they didn't want to see in the public eye.
That's a bad thing, for me, for a media company to have done and it is unusual + interesting.