Kindle for Android has always been a pig with its Data usage. It persists through successive updates, and sometimes uninstalling and reinstalling resets it to something more reasonable. On my Android 5.1 device, Data storage is 387MB, and I have only one book downloaded that is less than 1MB.
There is a bare-bones ‘Kindle Lite’ Android app that Amazon produces for Asian market where devices tend to be less endowed.
https://play.google.com/store/apps/d...klite&hl=en_US
However according to Google Play, it is ‘incompatible with your device’ so I can’t try it out from that source at least. There seem to be a number of sites you can download an .apk from.