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Android phones do this also ("unknown tracker is traveling with you")

The presence of an iPhone is what gave them away, reporting the location of the AirTags to the Find My network.

Which has a benefit of alerting you if a stalker has planted an airtag on you or your car or something

I had alerts on my Pixel 6 that an AirTag was following me, so not really.

Good luck finding the air tag among 15'000 tools