Because you can't view digital content without a computer. At a fundamental level, your interaction with it must be mediated with the aid of a third party. Nobody thinks digital lacks utility but it is inherently ephemeral.
If I give you an old photograph to look at, then all you need to look at it are your eyes and whatever light happens to be about. If I hand you an SD card, you need to go and find some sort of computer to stick it into, as well as a source of power for said computer, although I think that latter consideration might cease to matter in a couple of decades.
Because you can't view digital content without a computer. At a fundamental level, your interaction with it must be mediated with the aid of a third party. Nobody thinks digital lacks utility but it is inherently ephemeral.
If I give you an old photograph to look at, then all you need to look at it are your eyes and whatever light happens to be about. If I hand you an SD card, you need to go and find some sort of computer to stick it into, as well as a source of power for said computer, although I think that latter consideration might cease to matter in a couple of decades.