Satellites are expensive, people rarely deploy them for fun. If an existing satellite offered the same functionality people would likely license data/airtime/what-have-you from the operator of that satellite rather than launching their own.

As long as their orbital information is properly registered and they have a proper end-of-life plan for them there's little risk in deploying new satellites; if you want to get concerned about crowding the orbits, China deliberately blowing up a satellite a couple of years ago was much more problematic.