I read an opinion piece somewhere that Starlink is just busy work to keep SpaceX launching rockets, but because gestures at Google I can’t find it. This Twitter thread nakes this theory plausible.
And, any theorized environmental impact has to be compared to the existing natural process of space dust falling into the atmosphere, and measured against the saved costs worldwide of wires and cell towers and travel not needed, especially as capacity increases in the future. Which is practically impossible to measure, but failing to account for difficult-to-measure costs is a classic error people make when evaluating things like this. And of course there's the extra benefits of coverage over oceans and poles and to ships and planes that you can't get any other way.
Just like 5G could potentially reduce the overall consumption, before we realize that actually we use it to the point where it increases them.
Or just like any other technology, after all.
If you aren't launching every week, then the costs of those staff start to dominate, and the staff aren't paid less if you launch fewer rockets.