The whole reason for "privacy sandbox" is to still do user tracking, but do it in an anonymous way that they hope legislators won't go after. It's Google seeing the writing on the wall that legislation will soon ban third-party cookie tracking and fingerprinting and the like, so they need to be proactive and protect the ad tracking business.
A better name for it would have been something like "anonymous user tracking / data collection", but "privacy sandbox" is probably a good marketing term to fuzz what it's really doing. To a normal user it makes it sounds like Google is doing something good and protecting them, while it's really just "please opt in to our new more anonymized tracking technology while still allowing us to track you".
A better name for it would have been something like "anonymous user tracking / data collection", but "privacy sandbox" is probably a good marketing term to fuzz what it's really doing. To a normal user it makes it sounds like Google is doing something good and protecting them, while it's really just "please opt in to our new more anonymized tracking technology while still allowing us to track you".