Not every aerial robot is made of metal, and many are very small. They would be no match for a hawk.
Another reason not to trust business transactions to these stupid things.
No, these devices are designed to be as light as possible and the use of metal components is minimized but the rotor blades are very sharp-edged and spin very fast. The hawk flew away, but his wings and feathers were not likely involved. I'm thinking of the lower leg, toes and talons.