> Do you really think that a $400 cost is of any issue for military use?
If your name is Ukraine then yeah. Effectively halves the number of drones you can build
Sorry, this is wrong. They'd be based on long range UAV's - not short range FPVs. Ukraine have been building about half a dozen types of different long range drones and are producing a good number of those every day now (some with jets making them analogous to cruise missiles). They're much more expensive than a cheap FPV with an RPG warhead strapped to it.
> Effectively halves the number of drones you can build
You're confusing the price tag of an FPV drone (for which this tech has no use, 4km precision is roughly the range of such drone, so even without a positioning device you'd get such a precision…) with the one of a long-range drone which is hundreds of magnitudes larger, even for Ukrainians.