What's fundamentally different between music and audiobooks? And more generally, what's so different between literature and other media? For movies and music,

What's fundamentally different between music and audiobooks? And more generally, what's so different between literature and other media? For movies and music, we have streaming services where we have access to everything for a monthly fee, or we can buy one off physical or digital copies. For (audio) books, there is no equivalent to the streaming model, subscriptions are just giving you access to a set number of works per month. That's especially ironic since libraries have been "all you can read" since before computers even existed. I have seen online libraries use ridiculous DRM schemes to emulate the fact that they have a limited number of copies to lend, why? Video games are also not sold through "all you can play" platforms, but this is more understandable since they are more difficult to standardize due to their nature, and the monetization schemes are varied, and yet we are getting there.