While I've also always thought about this model, I'm curious as to why Spotify doesn't do it? Is it hard to calculate the revenue from a single user? Or is just

While I've also always thought about this model, I'm curious as to why Spotify doesn't do it? Is it hard to calculate the revenue from a single user? Or is just in their interest that it's complicated? (Btw it should probably be listening time and not nr of tracks, or we only get 30s tracks going forward). Also, would law of big numbers make it so that this kinda evens out like this anyways with today's system?