Any iOS device will relay the AirTag’s beacons to iCloud—-not just your devices.
If you lose a tracked device, you can see its location if a random person’s Internet-enabled iDevice hears any of its chirps. The stranger’s device doing the relaying is unable to decrypt the contents; it just forwards the data to Apple.
Can you share how you did that? I've been trying to achieve that for both Bluetooth and Location Services (mini-rant: not adding a CC toggle for that is such a dark pattern) but haven't been able to pull it off.
The whole point of everyone's objections is that it also can be spotted by the wider network of all the other iPhones in the world, including whoever steals it (or is being stalked using it).
Doesn't mention what version, but even with Bluetooth 5.0 the maximum range would be around 400 m/1.000 ft under ideal circumstances.
So the tracking would only work if you actively pursued the target to stay in range.
Probably much more practical to go for an actual GPS-tracker, magnetic versions of those can be bought on Amazon for like 50 bucks.