Based on both anecdotal evidence and recent articles, it seems as though people in the startup community often don't have many compassionate outlets they can leverage to talk to others who are either going through something similar or have gone through something similar before. By finding someone relatable to share experiences or learnings, they can release some of the pent-up emotion or frustration that they have and be able to move forward.
Furthermore, this is not designed to replace working with a mental health professional--not in the slightest! This is more purpose-built around finding peers who have the right context to really understand or comment on what you're going through and empathize. This isn't meant to be a counseling service.