The understanding that defense doesn't exist was drilled into me by a sergeant who I'll never forget. Only attack exists. That's real doctrine.

Bitcoin doesn't fix that. It will be very cheap to put some stuff on a drone, and a QR code, and tell people "send btc here or else," if that's even the motivation for the attack. That motivation hasn't been needed so far for militaries to use drones. If you look at states like Israel, you see a state motivated to depopulate a particular area. That's an extreme case, but a lot of military activity is just controlling movement or getting people to leave. Its only a matter of time until drones with facial recognition are used selectively, or just used to harass humans to get them to leave. Or just go Israel style and kill as many as they can. Yes, nation states can print to pay for it, but even when they can't, they will still use drones. The whole purpose of a drone is to reduce costs. And they do, massively. Even if no states and no armies exist, people will still put weapons on drones. They'd be insane not to.