Stanford has studied the privacy policies of six major AI giants, including OpenAI, Google, and Meta, and the conclusion is extremely alarming upon careful consideration: These six companies are all using your conversation to train their models. It is enabled by default and has not really sought your consent. The following are the actual findings of this paper. They evaluated all these documents based on the California Consumer Privacy Act, the most comprehensive privacy law in the United States. The result is even worse than you imagined. Every company collects your chat data by default and feeds it to the model for training. Some companies keep your conversations indefinitely without expiration time or automatic deletion. Your data will always lie there, feeding future versions of the model. Some of these companies even require human employees to read your chat records as part of the training process. Not an anonymous summary. But it's your authentic dialogue. But the real danger lies here: For Google Meta、 Companies such as Microsoft and Amazon These giants also operate search engines, social media platforms, e-commerce websites, and cloud services. Your AI conversation won't just stay inside the chatbot. They will be merged with all other information about you that these companies already possess. Your search history Your shopping data Your social media updates The file you uploaded Researchers have described a real-life scenario that should make you pause and contemplate deeply: You ask the AI chatbot for a heart healthy dinner recipe The model infers that you may have cardiovascular disease This classification tag subsequently flowed into the company's broader ecosystem You are starting to see drug advertisements These pieces of information have reached the insurance database This impact will continue to accumulate over time You just asked about dinner, but the system created a health record for you. When you see the situation of children's data, the problem becomes even more serious. Four out of six companies seem to have included children's chat data in their model training. Google announced that it will use youth data for training with opt in consent. Anthropic states that it does not collect data from children, but does not verify user age. Microsoft stated that it will collect data from users under the age of 18, but claimed that it will not be used for training. Children cannot legally agree to this. And most parents are completely unaware that this is happening. The opt out mechanism is like a maze. Some companies offer exit options, while others do not. The companies that provide exit options hide the button deeply in the settings page that most users will never find. The privacy policy itself is written in obscure legal terms, which even professional researchers responsible for reading these documents find difficult to interpret. And there is another structural problem that no one has solved: There is currently no comprehensive federal privacy law to regulate how AI companies handle chat data. The laws pieced together by various states have left huge loopholes. Researchers explicitly call for three measures to be taken: Mandatory federal regulation; Model training must use active opt in instead of passive opt out; And before entering the training pipeline for chat input, personal information must be automatically filtered out. Currently, none of these three measures exist. The extremely uncomfortable truth is: Every time you input content in ChatGPT, Gemini, Claude, Meta AI, Copilot, or Alexa You are all contributing to a training dataset Your medical issues Your emotional state Your financial details The private document you uploaded And the companies that do these things are doing everything in their power to make it impossible for you to stop them. https://arxiv.org/abs/2509.05382 PS: We are not paid users, we are paid textbooks!