Those big super tankers operate at like $1m a day.. drones seem like they would be mosquitos in comparison. Maybe useful for spotting fires but I think satellite are the best plus traditional look outs. AI for sat images to spot wildfires is probably already done. It could track storms (lightning etc..). A bigger issue for wildfires is removing fuel sources which nobody does. A wet winter and spring fuels fire season.
Improving fire code is more likely to have a bigger impact. This is basically all about money though.
Airborne drones can't carry enough water to be useful for extinguishment, but land-based drones could, and a swarm of mini-bulldozers to clear a fireline would be even better. Getting them to work reliably in rough terrain with lots of vegetation would be a big challenge though.
Improving fire code is more likely to have a bigger impact. This is basically all about money though.