Hardware

I'm just trying to answer the asked question, space is absolutely huge and satellites are very small. If you want to think about vectors and potential debris from collision those are other questions - them all moving at different speeds and directions increases the chance of overlap but not into significant numbers and of course they don't just throw them up and hope for the best they know what they're doing and can maneuver to avoid problems.

The theorized great space collision resulting in a field of debris is a valid concern but a bit of a y2k fear mongering type story that everyone tells because it's fun not because it's actually going to cause problems. China has already run tests of techniques to deorbit trash and it worked well. Was there a need we could solve the problem, but there's unlikely to be a problem with everyone so aware of it and with efforts to mitigate potential causes.