What I posted before might have been unclear. I will try to explain myself better:
(A) Mozilla makes available the raw APK for Firefox for Android. It can be found at the URL below [1]. Is there anything similar for downloading the APK of OpenVPN Connect for devices that don't have Google Play access?
(B) Is there any work being done to submit OpenVPN Connect to the Amazon Appstore?
[1]
https://ftp.mozilla.org/pub/mozilla.org/mobile/releases/latest/android/multi/