As long as the externalities are paid for, I don't see the problem. Musk has made the world a worse place in many ways, but I don't see how this is one of them.
You're saying if someone offered you a billion dollars to launch a satellite no different from most other satellites already in space, you would say, "No, thank you, madam!" I'm skeptical, but if you insist, I'll take you at your word.