in less than a month here in the UK, when the new rules come into play,there will be no need to have any formal training or certification to fly a drone for commercial purposes ,and then receive payment or reward for doing it,the distinction between commercial and hobby will be gone
and the level of training to fly different drones will be based on weight of the drone and intent of the flight and location this will include having insurance cover and record keeping and the appropriate permissions in place to enable the flight to take place safely