You say it like Spotify has loads of bargaining power in this negotiation.
When Spotify started whether the big labels would even licence anything to such a service was far from a given. Many digital music platforms had failed in the previous 10+ years cos the labels wouldn’t work with them.
The way I see it a Spotify subscription is about the price of a CD per month. So the spend is probably similar for most people as the amount they would have spent on music previously.
The difference now is that people listen to a much much larger number of songs in total in any month. They don’t listen to one album over and over and over again like before. So that same spend gets spread way more thinly than previously.
Lastly on the label issue the labels power is significantly undermined. You don’t need a million dollars to build a recording studio and make a record any more. There is much more scope to put out your own shit and get 100% of the streaming revenue.
New times, new reality. The labels treating streams revenue like they did CD revenue shouldn’t surprise anyone, and is not Spotify’s fault.