I was just thinking today that if we are allowed to cage animals who have the mental development of a 6 year old, why can't we justify caging people who have the mental capacity of a 6 year old.
It's hard because music you can actually track how many people are listening to what songs and how much of the song they listen to and compensate accordingly.
If they were able to track how often a person used an app then I don't think that would be too bad except for extremely niche apps which are usually enterprise already. I would take a smaller payment if I got paid $0.01 for three minutes my app was open on a phone, rather than charging $0.99 (or even $2.99)... It depends on the app though