Dazzle camo and decoys seem like the obvious answer, and anything flying is still gonna have to contend with AA weapons platforms. It doesn't seem like it would be the hardest problem in the world to honeypot an autonomous drone into a kill box.
Those sound like captchas for drones to me. We've already started to see that bots can defeat some of those better than humans can.
Decoys are likely the best answer, but not necessarily practical for offensive operations. And given the low cost of drones, likely limited in usefulness anyway.
