It's not a limit. 250g is the minimum weight at which drones are regulated. There would be little point in a new law which excludes drones under 2.2 kg as that

It's not a limit. 250g is the minimum weight at which drones are regulated. There would be little point in a new law which excludes drones under 2.2 kg as that is nearly all drones. FAA is not a good example to cite either as their position on drones is a total mess and their existing regulations are a patchwork of legacy rules designed to cover model aircraft.