This is sad and tragic but ultimately I don't think Mongo bares any responsibility here

Annie was on leave receiving intensive mental health treatment when MongoDB demanded her immediate return to work. She asked for an extension to complete her treatment, or at the least a short period to consult with her medical providers about whether and how she might be able to return to work before the treatment was completed. Instead, MongoDB terminated her health insurance and then fired her in violation of the Americans with Disabilities Act and the New York State and City Human Rights Laws. Shortly afterward, Annie took her own life.

Yeah demanding she return to work is the part where they bare responsibility.

The frustrating part about being an American is tying work to healthcare.