This assumes all artists are alike, which patently they are not. Artists that make amazing music that doesn't stream well, are pretty fucked and their revenue stream from recorded music has basically vanished.
Spotify algorithm filters these artists hard.
I call these artists peak experience artists, they make music you might listen to occasionally, perhaps even just a handful of times, but you don't listen to in the background daily / weekly / monthly.
Whereas' pre streaming to listen to it once you bought a CD for £14.99 and the label got £7 and the artist on an indie got ~£3.50. Now the artist gets <0.01p for that listen.
Huge difference and a chiling effect on the sort of music that can be made.
(I've worked for a big UK indie and currently manage musicians and have seen the trends in music distribution first hand since 1992).
Many artists who happily make Spotify friendly music do handsomely if the algorithm is generous. But many do not and can no longer have a full time career in music.
And no, live shows do not make up the shortfall. Not all artists are comfortable playing live and it's harder for artists to reach critical mass where touring is even possible / profitable.
Unless they are already wealthy, which is why you see again and again the same ilk of rich kids breaking out in music (see Fred Again, Fourtet, etc etc).