Space is big and still very hard to get to. A kilogram of payload in orbit costs several times as much as a kilogram of silver on earth, even after SpaceX's aggressive scaling of capacity. No one's going to be spending that kind of money and effort carelessly. I was more worried about SpaceX becoming monopolistic, so I'm encouraged to see this deal.

Don't project your worries about pollution on Earth-- which is a much bigger problem!-- onto space industry which is at a much much earlier stage. The "burning-up" thing sounds extremely speculative, like you're looking around for reasons to dislike this. Space is exciting and inspiring-- and yes, that includes commercial uses, since realistically we couldn't afford to expand science or exploration in space much otherwise!