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They probably have other ways to monetize upon the show. And/or gain elsewhere thanks for the show. And/or gain other non-monetary advantages.
For example a successful big title could help Amazon stocks go up, or lessen a fall. Even if just a little tiny bit, the sum gained or saved could be enough to make that investment into the show worth it.
Or I dunno, they sellin mugs or t-shirts on the side. And buy it on Blue-Ray or whatever is the popular data storage medium. With director commentary and cut scenes.