We are contacting you regarding a past Prime Video purchase(s). The below content is no longer playable on Prime Video.
In an effort to compensate you for the inconvenience, we have applied a £5.99 Amazon Gift Card to your account. The Gift Card amount is equal to the amount you paid for the Prime Video purchase(s). To apologize for the inconvenience, we've also added an Amazon Gift Certificate of £5 to your account. Your Gift Card balance will be automatically applied to your next eligible order. You can view your balance and usage history in Your Account here:
It's Google's store policy that apps cannot be removed from a users library. If you purchase it, and the app later is delisted, head to manage apps. List apps not installed. I have stuff there from when I had a device that ran Android 5. I've never had an app disappear. They just eventually reach "can't be installed on this device."
It may be store policy but it unfortunately does not prevent it from happening. Two examples i can remember are "Gentle Alarm" and "Manhatten Project". Both I purchased and no longer available. Also not in my "not installed" list unfortunately.
I may have used the wrong terminology in my earlier reply. There is "unlisted" where the developer leaves the app in the store but removes it from the search. "Carcassonne" by Exocet comes to mind. It is still available for me to install but searching for it only shows the version by Asmodee.
Then there is the complete removal of the app. Gentle Alarm and Manhatten Project are 2 examples. :(
Then you should report the developers for breaching the Google Play Developer Policy.
I don't think they are around anymore.