I’ve always purchased any audiobooks that I want to listen to even though I haven’t listened to many recently.
I didn’t realize so many audiobooks were available on YouTube (free). Posted a few but seems to be many new and old. YouTube premium can download and listen anytime.
YouTube has many English and Chinese audiobooks and if you have YouTube premium then you can download to your iPhone etc. ., with AirPods, learning/listening is convenient.
I’d guess some Chinese website has more than YouTube since the Chinese website will not worry about copyright, especially foreigner copyright.