Inside the Hidden Market Where Your ChatGPT and Gemini Chats Are Sold for Profit

Millions of users may have unknowingly exposed their most private conversations with AI tools after cybersecurity researchers uncovered a network of browser extensions quietly harvesting and selling chat data.Here’s a reminder many people forget: an AI assistant is not your friend, not a financial expert, and definitely not a doctor or therapist. It’s simply someone else’s computer, running in a data center and consuming energy and water. What you share with it matters.

That warning has taken on new urgency after cybersecurity firm Koi uncovered a group of Google Chrome extensions that were quietly collecting user conversations with AI tools and selling that data to third parties. According to Koi, “Medical questions, financial details, proprietary code, personal dilemmas,” were being captured — “all of it, sold for ‘marketing analytics purposes.’”

This issue goes far beyond just ChatGPT or Google Gemini. Koi says the extensions indiscriminately target multiple AI platforms, including “Claude, Microsoft Copilot, Perplexity, DeepSeek, Grok (xAI) and Meta AI.” In other words, using any browser-based AI assistant could expose sensitive conversations if these extensions are installed.

The mechanism is built directly into the extensions. Koi explains that “for each platform, the extension includes a dedicate

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