The one head-scratcher remaining is that the new iPhone seems to check whether it’s in a country that allows UWB fairly frequently, even though the list of countries where this feature is not yet permitted is fairly small, and includes Argentina, Indonesia and Paraguay. A complete list of countries where iPhones can use UWB is here. The principal remaining concern may be that these periodic checks unnecessarily drain the iPhone 11’s battery.

TL;DR Apple didn't actually explain anything, they are running something constantly searches to see if the phone is using something called "Ultra Wideband" that sends your location along with it every time. The majority of countries on earth do not use this technology, and there is no reason for that to be on.

Suspect.