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ChatGPT Search. From the help page describing ChatGPT's recently updated search feature:
ChatGPT also collects general location information based on your IP address and may share it with third-party search providers to improve the accuracy of your results.
This underplays the significance of the feature in my opinion: any time ChatGPT runs a search it can gain insight into your current location.
Just the single word prompt Weather shows how that can work: