Not sure about Kindle, but iPhone and Apple watch collect your location history even in airplane mode (by saving the list of wi-fi access points):
https://support.apple.com/en-us/HT207056, see "Significant locations"
https://support.apple.com/en-us/HT207056, see "Significant locations"
Last but not least, Significant Locations data is not just described as "end-to-end encrypted and cannot be read by Apple", it's clearly in the list of items under "By enabling Location Services, location-based system services such as these will also be enabled": e.g., if you're really, really bothered by this, you can turn it off.
Even if you trust that Apple does not use it for anything else, you cannot check this (no source code) and you cannot be sure that they won’t start using it in the future.
Opt-out tracking is not ethical. It should be opt-in.