Spotify's entire promise was "we solve the music inequality problem by just pooling all subscriber money together and then we do an equal(-ish, record labels iirc got slightly different deals) split depending on how many people listen to your music." It kinda sells the idea that if you're just popular enough, you can make it big on Spotify. Of course practically that's been a lie for ages (numbers showcased that only the top 0.1% could afford to live off of Spotify alone, and all those songs are owned by the established record companies anyway), so you could say this is just dispensing with the charade to avoid transaction costs.
I do wonder about the ripple effect this could cause for indie artists; Spotify just told them to go fuck themselves and there's pretty much no incentive to use Spotify anymore now that they pulled this stunt.
If you want to support artists directly, it's still always better to just buy the albums. Most of them have Bandcamp pages and for now, Bandcamp provides a good deal (and as a customer you can just download the FLAC files).