I think they are selling good fire drones already but seems like under report its avenue. A real manned drones should earn more than that. Ehang both manned and unmanned is proven and tested. Cargo srone and fire fighting drones can easilt earn at least 20-40 millions by now since it est. manned will take a while for human to accept a taxi. At least 20 m profit per year no pb. Hope the reporting of profit avenue it real and transparent.
Can research anywhere on drones and buy anywhere... but those real stuff applications drone and heavy weigh drone is from ehang. Both UAM manned taxi drone as well as unmanned heavy weight drone. Ehang is still leading the world . Check it out the website and recent manufaxturing plant..