Quite a lot actually. If the software engineers write an app that’s a bloated buggy mess that inconveniences people, some people will look for other ways to listen to the music they want to hear.
For musicians, they have other avenues (arguably better anyhow) such as Bandcamp. I’ve bought tons of vinyl albums, tapes, and even just digital releases from there.
Your first point is incredibly subjective. I love the spotify app aside from the fact they keep gutting its features. I've used almost every other music app in testing to potentially leave spotify. I've been a spotify member for 16 years and can't think of a single time I thought it was bloated.
The spotify carplay/android apps absolutely DESTROY the other car apps.
I hated every single other app. Quboz, Tidal, Apple, YT, Amazon.. Most of them were so featureless I felt like I was using Winamp. But some people do love that.
For musicians, they have other avenues (arguably better anyhow) such as Bandcamp. I’ve bought tons of vinyl albums, tapes, and even just digital releases from there.