Despite there being close to 10,000 satellites up in orbit around the Earth, it is not even close to being crowded. You would probably need around a half billion satellites (500,000,000) before it starts to become a bit of a concern. Even when we get that many up there, they will likely keep them in “belts” (sort of like interstate highways) that criss cross the atmosphere at certain altitudes.
but they have nothing to fear, If Earths atmosphere dissapears into space because of balnketing the sky with garbage , they will just blame Man Caused Climate change