Talkspace has amassed “one of the largest mental health data banks in the world,” according to reports to investors, containing 140 million message exchanges.

She confessed her worries to her therapist: her marriage, her finances, and self-esteem. Therapists are legally and ethically bound to confidentiality, but two years later, a transcript of every word typed to her psychologist using the app Talkspace was produced in court by her former employer.