The idea was that data for ad personalization would remain on the user’s device. The system will group people based on their interests, allowing them to show relevant ads without tracking them individually. This can also put an end to pop-ups asking for cookie permission.
But according to Google vice president Anthony Chavez, low adoption of Private Sandbox technologies forced the company to shut down most of the subprojects and abandon the brand as a whole.
Mass adoption of the system never occurred.
Source: Ferra

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