Apple did the same thing to Kindle for iPhone back when it launched. We submitted the original version to Apple with a fully functioning store built into it—and were then stuck in submission limbo. Two weeks later, Apple announces their intent to build in-app purchasing. The kicker: Apple wanted a 30% cut of every book sold on the store …and at the same time, had negotiated with book publishers that the publishers MU…
I've used the Kindle app ever since it launched, and have followed this fiasco. The trouble for someone like me is I would rather purchase my content from Amazon since I can read it on any device, not just an apple device. p.s. Do you know how I would go about recommending someone add the ability to have green or amber text on the black background?
If you're on Android:
1. go to Settings -> Info -> About
2. Draw a lowercase h on the screen (anywhere), and you'll see a "special color mode enabled", and should get amber on black. another letter gives you green on black, but I forget which :( . There's a bunch of hidden color combinations there :)
I'm not sure that exists on iOS, though
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For requesting it: help & feedback -> contact us -> give feedback is your best bet. I'm out of touch w/ the Kindle team, but at least several years ago many of the devs would obsessively read customer feedback (that wasn't deemed sensitive/PII)