I've read your posts carefully.
I think people can see which are the outrageous opinions.
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I said KOReader isn't available in the Play Store,
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I never disagreed with that. You strongly implied it wasn't available for Android. Android isn't iOS. It's totally trivial to install KOReader on Android.
The epubs are cross-platform unless there is DRM. There are many different Apps and physical ereaders and programs for Mac, Windows and iOS that work perfectly well and are similar to use. There is no value in renting an app to read ebooks. Some of your requirements are unusual or niche.
Almost everyone wants as plain a background as possible on paper, and evenly lit or contrast on eink, LCD, OLED. Coloured and/or textured backgrounds are either tiring novelty for most people, or hide how poor a screen is. Some people want white text on black which certainly saves a lot of power on OLED.
How much research and GUI programming have you done?
Don't expect people to spend a lot of time researching niche requirements specific to what you want.