Several movie and TV sites have come and go where you can just visit and watch without even creating an account. Quality might not be as good as a paid service and they are no doubt in the grey-to-red zone legally. I don’t see the same service for music.
Why do you think is there such a difference in trends?
I’m crying (deservedly) in iOS
Its just a frontend for YouTube music essentially. Maybe worth taking a look if someone makes something similar now with sideloading being an option
Edit: 2 minutes of googling lead me to this https://github.com/rphrishi4/RiMusic4ios?tab=readme-ov-file