I used to have a telecoms colleague who was a rigger, worked on sometimes very high masts and towers, arent you scared ever at that height people always asked him and he answered -'anything over twenty feet and you are dead anyway.
So as I assume these things will fly at considerable more than twenty feet above ground then they are inherently dangerous and non fail safe even if they are not up the flight levels.
The dilemma is are they safer now with no conflicting traffic or is it best to wait five years until the bugs are cleaned up but then there may be lots of others out there to collide with