The interface for Sync, as an example, made it much easier and more efficient to use. I would argue that 3P users use more calls because using those apps allow you to browse and interact far more effectively without cutting through the swaths of "He Gets Us" ads that Sync users never even had to see. Ultimately, I suspect that tha was the true reason for the API changes. Lost ad revenue. Judging by what I saw just today being stuck briefly on the official Reddit app and the website taking care of last minute issues after Sync went down, it's bad. Wall of ads.