One way it could work is if Spotify divided say $8 per user across all the streams that user listened to that month. So if a user only listens to Justin Bieber

One way it could work is if Spotify divided say $8 per user across all the streams that user listened to that month. So if a user only listens to Justin Bieber this month, he'd get the full $8 in stream royalties, while someone listening to more artists would redistribute their $8 across all of them.