I'm a Google music devotee (Youtube music now I guess - please stop rebranding) because it allows me to upload my own MP3s and listen to them remotely along with their normal music collection. The app sucks and I'd like to disengage from Google, but a couple hundred album uploads later and I feel pretty locked in.
I wish they would at least improve their god-awful UI. I'd even pay more if it meant basic sorting functionality of my own music library.