CHATGPT NOW KNOWS WHAT YOU DO ON OTHER WEBSITES VIA AD COLLECTOR

Summary from the TLDR Marketing newsletter

OpenAI's ad pixel uses a one-year __obi cookie tied to ChatGPT accounts and sends data to OpenAI when an advertiser's tag loads. It also collects hashed emails and phone numbers, unencrypted city and postal codes, and page paths containing medical and debt topics. The pixel works for logged-out users but appears limited to Chrome on Android, as iOS browsers block it.