Comment by tessierashpool

even a swarm of satellites has risk factors. we treat space as if it were empty (it's in the name) but there's debris left over from previous missions. this stuff orbits at a very high velocity, so if an object greater than 10cm is projected to get within a couple kilometers of the ISS, they move the ISS out of the way. they did this in April and it happens about once a year.

the more satellites you put up there, the more it happens, and the greater the risk that the immediate orbital zone around Earth devolves into an impenetrable whirlwind of space trash, aka Kessler Syndrome.