It is a pretty significant number of satellites. For whatever reason the FCC has taken up the role of regulating satellite collisions and such, and if you go dig up SpaceX's fillings you can see them discussing mitigating issues related to this (keeping probability of a collision for the entire constellation less than the acceptable number for a single satellite, making sure the satellites burn up on re-entry to mitigate "a satellite fell on my head" risks, etc).