The fact is drones should have a transponder of some sort. As a pilot, (helicopter) , It is a bit of a worry when being routed at lower altitudes, that there could be a drone out there. Even a small drone could easily bring a help down, and if it was over an urban area, the results could be catastrophic. We have all already seen videos of aircraft passing drones at close range, particularly over beach front areas in Florida, where it seems to be a problem. Everyone should fly responsibly, but there are always those who are not responsible, are just plain stupid or have a political agenda ( like the extinction rebellion people who shut London Gatwick airport las year ). If the day comes, when heaven forbid, there is a major disaster caused by a drone, that will be the end of it for all who enjoy this hobby. Fly safe, fly responsibly and get certified drone when they become available.