According to God of Prompt on X (citing @alex_prompter), a Stanford analysis found that six major AI companies—OpenAI, Google, Meta, Anthropic, Microsoft, and Amazon—permit the use of consumer chat data for model improvement by default, with opt-outs that are hard to find and enterprise customers typically excluded from training by default. As reported by the post, the review covered 28 privacy and policy documents across the six firms, indicating that prompts, file uploads, and personal details may be retained and used for training unless users opt out, while some firms lack confirmed deletion timelines for certain chat logs. According to the thread, Microsoft is the only company explicitly stating it attempts to remove personal data such as names, phone numbers, and addresses before training, and enterprise customers are generally protected automatically from training, creating a two-tier privacy model. As reported by the same source, disclosures are fragmented across multiple sub-policies—Stanford reportedly needed to consult six separate documents for OpenAI—which creates friction for consumers to understand or change settings. Business impact: organizations should formalize enterprise agreements that disable training, while consumers should locate and use opt-out controls where available, and limit sensitive inputs; vendors should improve consent flows and increase data minimization to address regulatory and trust risks.