Im not super into drones but 250 grams seems incredibly and excessively light. Sure, you can buy drones that aren't that much heavier than which could in unusual circumstance be a little dangerous, but if someone was to build some cheap DIY drone at home from parts im not sure how successful they would be making such a tiny model and lightweight model. 250 grams is almost half the weight of a baseball which could easily be going faster than such a tiny drone.