iPilot

Having a pilot on board is actually a lawsuit reduction on its own. "Pilot error" is the ultimate cop-out because the guilty party is almost always dead. The Atlas accident is perfect in that the FO falsified his application to Atlas. It may seem flimsy as heck to us pilots but in a courtroom Atlas (and Amazon) can say they were the victim too.

No pilot means the blame is entirely on the airline and the manufacturer.

And that's not even beginning to talk about hacking and other kinds of sabotage this kind of thing would invite. Just recently Garmin got hit by basic ransomware attack that shut it down for 4 days. This is a very advanced technology company with quite a few mission critical divisions (including aviation). If they can be taken down by someone opening a dancing cat gif in a random email, what about your airline? Think of your average dispatcher or crew scheduler you talk to on the phone and think they have what it takes to thwart even the most basic hack?

tldr: Drones have been around for decades. I don't think technology is what's holding it back.