People DO care about sound quality. The failing of Tidal is not because Tidal has better sound quality - and that people do not care for such. But yes, most people don't care. And most people have iTunes on their phones pre-installed and are accustomed to Spotify.
People have built lists and have their friends on Spotify, and shared lists, that's why Tidal is failing, they got in late. Norwegians don't want to switch from wimp or spotify to the sinking ship that is Tidal either, I think, and Apple apps usually look and feel better and are better integrated to the OS while Tidal and Spotify are kind of ugly.