HI, I think that the accident record of large drones -and airplanes without pilots are drones, mindless drones- is not good. The only crash database for drones i know is here:
https://dronewars.net/drone-crash-database/
One has to subtract those that were shot down, but add those crashes that didnīt make it into this unofficial record. Given the relatively low number of large drones (hundrets, not tens of thousands) , I think that we are looking at many more crashes than piloted aircraft would have had.