It's not zero, but it's smaller for obvious reasons, iTunes Store are paying once, when you buy the song, streaming services, adds upp everytime you listen to the song.
About profit, and what the artist is getting paid.
Apple is taking 30%. So from a $0.99 song, Apple gets 30 cents, and the artist gets 9 cents. Apple is getting 300% of what the artist is getting, they are making billions from iTunes Store sales.
Spotify are actually losing money right now. It has to do with their agreement with the record companies, they are paying as much for a free, ad-supported, user listening to a song as for someone with a paid Spotify subscription. That's why Spotify has decided to remove the original free, invite only, option, and seriously cut down on Spotify Open, the other free option.
With less free user, each artist will be paid more for each play, so I'm not sure that the image is correct about the current payout for Spotify.
Also, per the image, from the money that reaches the record companies, the artists are getting a bigger share from Spotify, 20%, than from iTunes, 12.5%. So you're wrong about where the record companies are tapping into the revenue...