Yes, this is exactly what I’m saying. Apple officially supports third party trackers, who’s manufactures are issued, by apple as a part of their MFI programs,

Yes, this is exactly what I’m saying. Apple officially supports third party trackers, who’s manufactures are issued, by apple as a part of their MFI programs, keys with which these third party devices must use to sign their pairing requests to the users apple account. Perhaps these $5 devices do indeed include legitimate keys from apple to use from this, perhaps they have copied one from another device.