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>SpaceX wasn’t involved in the research and can’t do much to try to block such techniques, though it’s unclear whether it would try.

well, government can always mandate to add artificial randomly floating frequency shift to break that Doppler based calculation to supposedly block the Taliban's ICBMs from precise navigation.

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I understand that Russia's "GPS" system ( https://en.wikipedia.org/wiki/GLONASS ) has been fully operational for a while now. The Taliban (or North Koreans, or others non-friends of the U.S.) don't need to count on U.S.-run geolocation services for their Important Stuff.

True, but not only US based companies are launching sattelites.

Spacex is the only one with enough volume right now for this technique to have good accuracy.

SpaceX will (and does) have good coverage but the accuracy will not be to anywhere what people have come to expect from GPS. At least not without major design changes to focus on this as a product from SpaceX.

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