For the same reason that you don’t see a huge bee-shaped shadow on the wall when a bee flies past your window – it only blocked a tiny part of the window at a time, and therefore only a tiny part of the light. [This](https://petapixel.com/2015/09/09/a-composite-photo-of-the-international-space-station-transiting-the-sun/) is what it looks like when the ISS passes between us and the Sun, and other satellites are much smaller than that.
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