ChatGPT Tracks Off-Site Browsing via Ad Collector

An investigation found OpenAI's bzr.openai.com sets an __obi cookie tied to a user's ChatGPT account; advertiser-site OpenAI code sends it back with browsing data such as products, articles and purchases, letting OpenAI link off-site activity to accounts. The author reproduced the mechanism and observed 936 advertiser pixels across 1,029 hostnames.

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