For audiobooks you should definitely look into your local library. They usually have a digital offering that includes fairly recent audiobooks. If they support overdrive, you can use Libby, otherwise there’s the Onleihe app.
There’s also https://www.bookbeat.com/de/ which is European and you can do libro.fm. Libro.fm is from the US but you can choose to support a German or European bookstore with your purchases.
Then there are the streamers like Deezer (French) and Spotify (Swedish) though Spotify has some very shady business practices like https://en.m.wikipedia.org/wiki/Controversy_over_fake_artists_on_Spotify
I’m aware that alternatives are scarce and Audible’s exclusivity scheme is making everyone’s lives harder.
If I understand this correctly, then this restriction only applies to Turkey. Which is exactly what you'd expect. If you violate local laws, then there are local restrictions. On a global level, everyone else can still interact with you.
Have I understood this correctly?