Neil Young returns to Spotify as other streaming services begin hosting "disinformation podcasts": "I cannot leave all those services because my music would have no outlet to music lovers at all"
Stephen Stills is one of the other major members of Young's supergroup, Crosby Stills Nash & Young, and Stephen Stills currently is listed as having 286,696 monthly listeners on Spotify.
Gola Gianni is a random rapper that I have never heard of before searching the word "mumblecore" on Spotify just 5 minutes ago, and he has 328,039 monthly listeners listed on Spotify.
I think you're both severely overestimating how many people are actually listening to a lot of these "classic" artists and also severely underestimating how popular random flash-in-the-pan artists are on Spotify.
edit: I didn't specifically use Young's monthly listeners right now because I suspect the news-worthy nature of his absence and then eventual return likely has temporarily inflated his numbers with the additional attention on him
2nd edit: I kept being curious so I kept looking at numbers for other "big name" bands.... I find it almost unbelievable that there is still apparently over 22 million people listening to Aerosmith monthly. I don't hate Aerosmith, but I'm not sure I could even sit through a whole album of theirs, so that 22 mil is breaking my brain.