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First. You have this in books too. For instance, every year around Christmas you can buy some sampler with topic related short stories in Germany. And they do contain living or dead authors whose works are still copyright protected.
Second. I would guess that this is more an economical or practical decision. The "Ten Best Thrillers of the 80's" that you wish to see would be a book as big as around 3.000 pages. I am assuming that you will find less buyers for it than for the ten single books. But with short stories it happens quite often.
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