Let’s say someone pays $10/month for Spotify. First Spotify takes their cut, let’s call that $3 but whatever it is. There’s $7 left. If someone ONLY listens to Taylor Swift that month then she deserves the full $7. If someone listens to 50 artists for 20 hours then those 50 artists can divide the $7.
You can set the pool size and divide the pool a few ways. I’ve got ideas for how I think that should be done. But in any case I’ve always thought the division should be on a per-user basis rather than entire ecosystem.