It doesn't calculate your amount of listening and determine the payout based on that. All listens are pooled together and all subscription money is pooled together. And the payout is determined based on that.
With OP proposal, they would get USD 7.
It also promotes botting, as spotify only counts listens, bot listening a ton to a fraudulent artist will siphon money away from essentially everyone.
"Money only goes to artists you listen" would be very good change
My $7/mo should be going to the artists I actually chose to listen to, not the stuff that droned passively for hours in background environments. Particularly when I'm actually a high margin customer for Spotify; the cost to them of my subscription is low since I spend so little time on the service. That makes it all the more galling that my subscription cost is mostly going to Taylor Swift and Ed Sheeran.