Kristin Robinson, writing at Billboard:

When Bloomberg reported that Spotify would be upping the cost of its premium subscription from $9.99 to $10.99, and including 15 hours of audiobooks per month in the U.S., the change sounded like a win for songwriters and publishers. Higher subscription prices typically equate to a bump in U.S. mechanical royalties — but not this time. 

By adding audiobooks into Spotify’s premium tier, the streaming service now claims it qualifies to pay a discounted “bundle” rate to songwriters for premium streams, given Spotify now has to pay licensing for both books and music from the same price tag — which will only be a dollar higher than when music was the only premium offering. Additionally, Spotify will reclassify its duo and family subscription plans as bundles as well.

To determine how great this loss in royalty value would be for the music business, Billboard calculated that songwriters and publishers will earn an estimated $150 million less in U.S. mechanical royalties from premium, duo and family plans for the first 12 months that this is in effect, compared to what they would have earned if these three subscriptions were never bundled