They do though: https://www.spotify.com/us/audiobooks 15h per month at least.

15h per month? Even without heavy listening, this sounds really low, doesn't it? And if you want to listen to a series if books, like Malazan book of the Fallen at 388h, you wouldn't know anything about the start by the time you are finished, as it's been two years. I would expect that most casual listeners who only listen to half an hour of content a day instead listen mainly to podcasts?

At least that's what I do when I don't have the time for audiobooks. But maybe I shouldn't generalize from my own experience, as everyone is different. For me, audible + the occasional torrent works quite well, and I wouldn't like to use the Spotify interface for audiobooks anyway, considering how bad it is for that use case.

Immediately had the same reaction, 15h is less than most of my books runtimes.

I checked out the FAQs on that page and apparently the 15 hours is just included with the Spotify premium subscription and that let's you listen to 15 hours of anything in their catalog.

Separate from that, you can also purchase books outright and it seems listening to those purchased books won't count towards that 15 Hours.

In that context, those 15 hours are actually kinda appealing to me since it would let you listen to more than the 5 min sample of a book you get on Audible before deciding to outright buy it or you could use that time to listen to a couple shorter books every month without having to purchase it.

Think I might have just convinced myself to look into it a bit more lol (I'm curious how good their catalogue is compared to Audibles)

Storytel is pretty popular in Europe

There are quite a few services like that. Though they resemble video-streamers a bit more, in that not everything is available everywhere. There's a lot of books that are only available in certain countries, and also a lot of books that are only available on certain services.

I use Storytel myself. It's available in many countries. I think it's one of the best services out there for the unlimited listeners.

Libby is great, but the wait times for popular books is heavy.

I use libro.fm. It doesn't have a subscriber model, but they give you DRM-free audio files.