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Partly this is because Amazon has had Mobile Data delivery for years, so they are not playing games, it's part of their system to reduce the size of large images. Also (excluding the 150 dpi dumb DX/DGX) they for years only had 6″ 167 dpi and then 6″ 300 dpi, then the 7″ Oasis. Also large minimum margins. Hence they had a system to limit the image size. Larger and fixed format electronic books often could only be bought & downloaded for an App, or sometimes the Fire, not eink. No paid for by Amazon mobile/cell delivery for Apps, AFAIK only eink with a cellular/mobile modem.
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