Or aren't interested in supporting closed corporations that benefit financially more than the artists who produced the music in the first place. It's a predatory system trying to get grandfathered in from the (g)olden music industry days, and to be fair involves bigger fish than streaming services (labels, promoters, etc.).
I'd provide a counter argument putting blame on artists: those who aren't selling and promoting themselves via a personal website or websites like Bandcamp probably aren't that interested in monetizing their music career.
As someone still paying monthly subscriptions to streaming services, I've recently begun to purchase more DRM-free music in lossless format. I get the best possible quality of audio, directly support the artist (or more directly than via streaming), and I get to keep the music indefinitely, as long as I can manage the storage requirements. It's not cheap nor easy, but I believe it's the fair approach for consuming music, and look forward to the day I disable my streaming subscriptions.