It is not their fault you don’t understand fundamentally what you are purchasing. When you buy media (digital or physical) you are purchasing a license to enjoy that media indefinitely. However that license has limitations. For the consumer or the company selling the license. The company that actually owns the media is the one at fault. But everyone is mad at Amazon (or Apple, or Microsoft, or Google), instead of record labels or movie studios. The only reason a movie company won’t come into your home and take back that copy of Shrek you bought from Tower Records back in the day is because it’s cost prohibitive. They can legally do so though.