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Not yet, but it could have in a future generation, or even a future firmware update.

Not really. It’s basically a system to store encrypted coordinates from Bluetooth ids seen. There is no mesh networking capability.

https://www.wired.com/story/apple-find-my-cryptography-bluet...

Anything of that sort would be a completely new, unrelated system.

AirTags come with UWB as well as Bluetooth. There's no real reason why they couldn't pass messages along. Firstly, AirTags that come within reach of one another. An Apple version of Nest could do the same, and would supercharge the FindMy network.

Once these systems are accepted they often get upgraded without significant reconsideration.

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