The biggest commercial drone I turned up in a quick search can carry up to 1000 pounds of cargo. The military uses larger drones for bombing and launching missiles.
You might find this site helpful.
https://uavcoach.com/big-drones/
Drones and robots are dangerous because they allow miscreants to operate at a distance with total anonymity.
It will end up requiring police-state level control to allow these two new technologies to remain available to the general public.
To own/operate either will in the future require a personal license that will be hard to qualify for, a huge bond, 24/7/365 monitoring of exactly where the device is located and what it is doing... this will include a kill-switch that could permanently brick the device. Possession of drones or robotics without a license will carry very severe penalties.
Our current society lacks the moral foundation to allow free use of these technologies.
It’s regrettable but true.