A lot of that is spam, algorithmically generated music. Even calling it that is generous. Titles like "baby sleep sounds" try to get playtime as mindless background music.
SoundCloud is especially bad with the spam. You'll find tracks there that are typo squats or similar which are just text-to-speech voices advertising a porn or casino site. The conversion rate on that has to be absolutely abysmal, I suspect the person buying this kind of "advertising" is getting scammed themselves.
But either way, the article's point stands, even if 9/10ths of new music on streaming services isn't made in good faith.
For a long time the authors at Baen books released ebooks without DRM.
One of the authors said that his problem was not in creating books, it was in getting people to read them because there are so many books being published.
Geez, I know a lot of music is getting made but I didn't think it was at that level.