Whenever the frequency, quantity or intensity of use drives up earnings, you are bound to get the same result: More "addictive" designs are better for earnings than less "addictive" designs. The difference (if any) between addictive because fun and addictive by design is irrelevant for this outcome.
What I will grant you is that the link can be more direct with ad funding. If a newspaper publisher knows that some very loyal subscribers only ever read 5 articles every morning, making that particular group read 30 articles would not drive up earnings.
But I think on average across all readers the link between reading more and higher earnings would still exist and hence the incentive to make the product more "addictive".