Where's the line drawn if the dangerous thing I mentioned before has a practical use? Maybe the balloon is filled with a mix that is toxic to something (crop, livestock, etc). Or there's a component of the payload that is dangerous when hit by a missile or making contact with the ground?

I'm guessing China sees this all as low risk research and nothing more exciting than that, but just trying to imagine what else might be going on, or come next. (I'm not anywhere near either China or the US.)