You still have the billboard article linked in your original comment.

I agree with you in part, so I amended that section so it's less absolute that "all of the $12" from a premium account goes to the artist they listen to exclusively.

Where I disagree is that premium accounts provide more revenue to artists they listen to. The court highlighted this point in the indictment - the defendant used some 10,000 premium accounts to listen to his own music. Had he used only free versions he would have received less revenue.

See the source I cited in this essay: https://dittomusic.com/en/blog/how-much-does-spotify-pay-per-stream, in addition to the indictment (page 5): https://www.justice.gov/usao-sdny/media/1366241/dl