On a side note Amazon & BlackMart can be installed via a passthrough.
Playing around with Android devices for well over 5yrs now I can tell you that Autel would have to intergrate Google Play with in the system as more then just the APK (main app) would be needed for any Android 'tablet' to use the app..
This is somthing that Google & Autel would have to join in on..
for now though do some Google searching towards how to install Amazon app store to your device as its better then nothing.
Just note that the more apps you install the more background services youll be running.
In turn it may hinder the performance on the 905/908.
Just somthing to think about..