Keep in mind Apple has a poorly documented and mostly unknown daemon called knowledgeconstructiond that cannot be turned off and solely exists to profile you based on accessing every Apple apps data - ical, messages, mail, photos etc, which is astoundingly personal info especially considering a lot of Apple users dump everything into stock apps, as the “strength” of Apple has typically been consistency of the platform
https://8rank.ai/game/apple-intelligence-personal-knowledge-graph
The person who wrote that article vibecoded an app that allows you to visualize the data captured: https://github.com/8rank/iKnow
It is basically all the gross shit that ad networks do. What does Apple do with this data, that has been aggregated since macos 13? Officially it’s probably to “enhance the user experience” but at a minimum it probably changes how Apple delivers ads to you. do they sell it? Who knows