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Technology
This is the official technology community of Lemmy.ml for all news related to creation and use of technology, and to facilitate civil, meaningful discussion around it.
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Technically couldn't they do this without "history"... Isnt that what cookies are for? I mean they can already show me shit based of what I say with my phone in my pocket, lol.
Cookies are a way of establishing persistence between a device and a site (most commonly a server session).
They could technically put some of your history in the cookie, but it wouldn't be retained between devices nor if you logout/clear-cookies.
To keep it consistent and build those suggestions across devices and logins, it needs to be saved on a server somewhere, which is essentially... history tracking.
Not legally because of various data tracking laws around the world. Maybe they can where you life, but then then need to be 100% sure they have that right. By making this clear they can argue in court they need to track this data, and that you have the option to not have it tracked.