On Safari Intelligent Tracking Prevention:
“first-party tracking cookies are shared with a large number of other domains immediately after being set. This sharing of identifiers among different trackers is meant to enhance their ability to track users across different sites. Limiting the amount of time that a cookie is set for will not be able to stop this sharing of information, thus proving ineffective in protecting user privacy.”

https://arxiv.org/pdf/2208.12370.pdf

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https://files.mastodon.social/media_attachments/files/111/188/022/272/746/706/original/adc549215fd47715.png