In the first 21 months of service, DoNotPay took 250,000 cases and won 160,000, appealing over $4m of parking tickets. Woebot is created by Alison Darcy, a clinical psychologist at Stanford University. Woebot uses cognitive-behavioral therapy to deliver scripted responses to users. 70 college students dealing with depression tested Woebot and their improvements were published in a research paper demonstrating significant benefits. Although the hype about chatbots is increasing, chatbot failure stories continue to .