If you choose to Accept all, we will use cookies and data for additional purposes.
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"If you choose to “Accept all,” we will also use cookies and data to... Non-personalized content and ads are influenced by things like the content you’re currently viewing and your location... Personalized content and ads can also include things like video recommendations, a customized YouTube homepage, and tailored ads based on past activity."
Author's summary: YouTube uses cookies to personalize content and ads based on your activity and location, with options to accept, reject, or customize privacy settings.