Exactly, if China launched thousands of satellites ruining everyone's astronomy efforts I'm sure there would be an uproar. But US doing it? Fine, business as usual.
I can see it "Trump: China puts 10000 eyes on the sky, they pretend they want to give Internet to the poor but they have cameras and spy on the traffic, and some reliable sources told me they can release viruses from this satellites in a targets back yard, this needs to stop , I will build a space wall and China will pay for it...
Well, that isn't really a useful distinction in any sense of the word. The American companies are doing it, because they are allowed to do so by their country. Most countries which have any kind of space capability have their own space agencies which say what is or isn't ok to launch. If the American space agencies approve things like Starlink, then the pollution of the Earth's view into space isn't purely on Elon Musk.
Point of order: intercontinental missiles, rockets, and radio telecommunications are highly regulated industries. The US regulators have approved (and not stopped) Starlink on both fronts. I do not know if there’s any international / UN body that performs the same roles?