Counter-intuitively, I think the fact that it's not a human seems to have a non-negligible effect too. It's a computer program you can share whatever with, and it'll never judge you, because it cannot. It reads exactly what you write and assumes you're faithfully answering, then provides a reply based on that.

I haven't been so unlucky myself, but I know many who've had terrible first experiences with therapists and psychologists, where I'm wondering why those people even are in the job they are, but some of them got so turned off they stopped trying to find anyone else to help them, because they think most mental health professionals would be the same as the first person they sought help from.