Basically a "feature" of Reddit which can be used to anonymously harass somebody on Reddit by having it send them a DM about suicide prevention.
https://www.theverge.com/2020/3/4/21164687/reddit-new-suicid...
https://www.theverge.com/2020/3/4/21164687/reddit-new-suicid...
On some subreddits every other post will be reported like this.
Meanwhile, Reddit tends to do very little about reports of even direct violence threats ala "I will find you and I will kill your children" etc. which are frequently found to "not be in violation of the terms of service".