That "something very very wrong" is the only way digital streaming purchases can ever be. If you're streaming content from someone else's servers, you're always just one mistake away from having everything disappear. There are ways around that which aren't as convenient as streaming, so if you're worried about it, use the alternatives. There's literally no way to have content streaming from Amazon and not be at their mercy to not fuck up. The only thing you can hope for is that the fix is quick and everything is restored in the end.

For many people, though, it's a tradeoff they're willing to make. Netflix, for example, is just too damn cheap and convenient for me to get upset about the restrictions (except why I can't play it on Linux when I can play it on Android and Roku...)