Amazon Prime Video is able to remove a video from your library after purchase.
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:
I use Amazon kindle to have my books synced across everything but I only use a burner Amazon and make sure I have my epubs backed up on a calibre server just in case they kill that account. Never buy digital shit from Amazon especially. They always pull this kind of thing.
There are exceptions to this. You can download MP3s of the music you buy from Amazon, last time I checked. Although it's been awhile, so they might've gotten rid of that and gone to 100% streaming like so many others have.