"Eventually they go out of business, leaving just Amazon as a monopoly distribution channel retailing the output of an atomized cloud of highly vulnerable self-employed piece-workers like myself. At which point the screws can be tightened indefinitely. And after a while, there will be no more Charlie Stross novels because I will be unable to earn a living and will have to go find a paying job."
If Amazon follows this hypothetical course of action, no one will write new books and then Amazon won't have any to sell. That is why your hypothetical situation is extremely unlikely to ever happen.
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