It would be nice to have clarification that the drone was being operated by a private individual. Is it possible that this was an accident by another group trying to address the wildfires problem? I think the reason for that drone flying in the first place is relevant to gain some context.
This is the only speculation laid out in the article around the operator:
The drone operator has not been identified, but there has been speculation online, with many social media users pointing to photography accounts that have posted aerial images of the fires.
The Los Angeles Fire Department released photos of the plane, including one showing the damage. It said the plane was struck by "a civilian drone."
The Federal Aviation Administration has opened an investigation, and noted in a statement that it had not authorized anyone unaffiliated with firefighting operations to fly drones in the area.
I don't know about the states, but in the UK. A police force decided to operate a drone for their own use. The CAA tried to politely educate them on the rules, and were, effectively told to eff off. A £35,000 ($43,000) fine was quite an effective slap on the wrist.
Detailed fire tracking. From the ground, it's difficult to tell if the fires is wrapping around you etc. By getting a bit of altitude, you can see what's going on, and act accordingly.
It's likely a scale thing. A satellite gives full coverage, but it's working at a large scale, with a long time lag. A plane is more local, with less time lag, but still quite a large scale. A drone is hyper local, with almost no time lag. Depending who is asking, all 3 can be extremely useful.
I can unfortunately see where communication could break down. Local firefighters wanted hyper local information. They didn't coordinate with the larger effort, and so the accident could have happened.
Bird dogs are small prop planes that monitor forest fires and help to liason between the tower and other fire fighting units (like helis and water bombers).
They're used a lot in remote regions where there are no control towers.
Each drop is carefully choreographed. A plane known as a bird dog arrives first to monitor the fire and draft a plan of attack.
Highly trained firefighters working as air attack officers sit beside the bird dog pilot and co-ordinate other aircraft on the mission, directing each drop to ensure the retardant hits the best spot.