The current streaming model has broken the direct (commercial) link between fans and artists. Buying a CD meant the artist would receive a guaranteed amount of money, but listening to the album on Spotify means something entirely different. The major streaming services collect all the subscription fees in one pot, then pay artists and labels on a prorata revenue share basis each month. This setup means that the value of a single stream is never fixed.
Source: Has Music Become a Disposable Commodity? | WQXR Editorial | WQXR