If you go further than that, successfully producing delivery drones means that they need to carry a payload safely to some destination, deliver the payload nicely (as in, smoothly leave a parcel on the ground), come back and be reusable. The drone flies by GPS, but doesn't really need a radio signal (ideally there is no operator, the drone just goes, delivers and comes back).
Killer drones are "one-way". They are defined by a lifetime of like 25min, ending up violently in a place where the operators care about maximising damage. They fly in war zones. Nobody really cares if some percentage of the drones falls from the sky or doesn't explode upon contact. They need to fly in GPS-denied mode, and they probably need a radio for the operator to select the target when the times comes. This has to be a military-grade radio that works in the presence of jamming to some extent.
Those are very different projects. Feels a bit like saying that subsidising personal cars is good for the tank business.