I’m part of the moderation team on a large Discourse forum for a consumer product. We have an issue where complaint topics pop up on the Google front page and we get a significant number of hit-and-run posts from users finding the topic via Google, making an account, posting something toxic or inflammatory, and never returning.
It’s fine enough to handle through moderation, but it would be a great feature if we could toggle the noindex tag on the topic without resorting to unlisting the topic altogether.