Do you know what all those puffy clouds coming out of the engines at engine cut off and start up are? Kerosene or methane and oxygen. Do you know what injecting methane and kerosene into the upper atmosphere does to the planet? No, no one does because it wasn’t ever a problem when there were 5 launches a year. Now that there’s 5 launches a month we’re getting to the find out stage.
Same with starlink. What does aerosolized aluminum (and whatever else is “just burning up” on reentry) do to the upper atmosphere? When there were one or two satellites a year how would you know? Now that there’s several a month (20 in the last launch that didn’t make it up) we’ll find out.
I’m going to go out on a limb and say none of that will prove beneficial to life on earth. But yeah, the rocket is pretty cool.