They pass on a commission. I've found a couple articles that claim it's a 50/50 split (https://www.fastcompany.com/90489801/libro-fm-kanopy-audiobo...), but I don't know if that's true at all or true for every store. Since they don't disclose it, I'm guessing they have different deals with different stores.
Can someone explain how this works? Do we actually buy from a local bookstore or do they just pass a commission to the local bookstore on each sale?