I worked on a shared task (CLPsych [1]) that estimates mental distress severity. So the classification task was to determine how acutely a user message/post on a mental health forum would require moderator intervention. Some people announce their suicides live on the forum for instance. You want to point the moderators to those people asap.

Our research group applied this tech to Belgium's suicide prevention center chat tool, so the workers can prioritize based on severity.

1. https://aclanthology.org/W16-0312/