Unlisted topic updates go to "Send me an email for every new post" setting users

For instance if posts are being discussed like this where they need to stay private (although not guaranteed private of course if someone happened to have the link):


Of course emails should still go out to anyone that happened to have gone in & marked the topic as Watching or Tracking, but to receive email updates to a topic they otherwise never interacted with seems like a loophole to me.