Nope, it is in fact prop drones using them. I couldnt quickly find a good article or anything on it, but I'm pretty sure because the fiber is just draping freely from the drone to the ground there is plenty of space for the necessary curvature, which I assume isn't actually that big since it is carried on spools on the drone to counteract getting tangled.

I'm sure there are some specific downsides and more nuanced limitations but the ability to not be affected by RF jamming outweighs it.