More like 30 years but your terminology is slightly off: I have music I bought in the 90s which still works fine because they sold it as MP3s without DRM and I was able to make my own backups. There’s nothing wrong with digital goods as a concept but we should be consistent in how we talk about it: if it involves an outside service, it’s a rental no matter how the seller describes it. If you can make your own copy and survive a corporate bankruptcy or merger, then it’s a real purchase.