OpenAI's ChatGPT is the most popular AI chatbot, and the company's weekly active users have surpassed 400 million. (File image) OpenAI has removed accounts of users from China and North Korea who the artificial intelligence company believes were using its technology for malicious purposes including surveillance and opinion-influence operations, the ChatGPT maker said on Friday. The activities are ways authoritarian regimes could try to leverage AI against the U.S. as well as their own people, OpenAI said in a report, adding that it used AI tools to detect the operations.