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For browsers that implement strict cookie partitioning, the privacy concern is moot. With this, the cookie jar that's used when chatgpt.com is a 3rd party site

by varenc 13d ago

For browsers that implement strict cookie partitioning, the privacy concern is moot. With this, the cookie jar that's used when chatgpt.com is a 3rd party site is completely separate for the jar used on the 1st party site. So your chatgpt.com account can't be linked to your ad views. Since this has been standard ad tech for awhile, browsers have reacted to this to implement cookie partitioning for exactly these privacy reasons.

ferro_ 12d ago
Modern adtech fingerprints your browser regardless of cookies, so they can still know who you are. The fingerprint consists of a combination of facts about your browser that together uniquely identify it (screen resolution, timezone, installed fonts and browser extensions, OS version, User agent, even GPU with some forms of canvas fingerprinting, etc.) ChatGPT uses fingerprinting too. Cookie isolation isn't relevant, only anti fingerprinting techniques are.