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cant they track by just ip address? for most, the ip address is quite unique. Apple only disallowed the unique id from being passed around right?

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On Wi-Fi, you're going to have multiple people sharing one IP. On cellular... good luck.

yeah on wifi, but if your home, its only your household. i thought cellular you get a unique ip? or does the cell operator hide your ip. i'm not aware how routing on cellular works.

> i thought cellular you get a unique ip?

In the US at least, yes, because most cell providers switched to IPv6 long ago. In other places, carrier-grade NAT is widespread.

CG-NAT is widespread in the US as well, but is only used when a site isn't reachable over IPv6.

True, but in this particular context the IPs would be unique, as Facebook has been IPv6-native for many years.

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