We usually scale ours to around 800x1200px and in png format. No rejections by Apple so far for that reason.
So yes, it is really weird.
The iTunesConnect PublisherUserGuide (see post #1 in the following thread:
https://www.mobileread.com/forums/sho...=iTunesConnect )
only says this about images:
Quote:
Images
* Images that have any unused or transparent areas should be PNG format with transparency.
* Because there is limited screen real estate, book images are automatically scaled. For this to correctly work, images should be at the correct intrinsic dimensions when created instead of hard coding dimensions in the image tag itself.
* To ensure proper viewing of images in content, use the HTML img tag instead of wrapping images in svg:img.
* The maximum recommended size is about 11 MB of un-encoded image data per chapter.
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(edited to add link to Apple documentation)