Musicians can complain when they want a bigger cut and it's fixed the next day. App developers and content producers get emailed 'we are taking more out of your cut' or 'if you don't want us to show ads near your content, reply to this email with "opt out"'
Don't app developers get a much bigger cut of revenues than musicians do? That being the case, I don't understand your comment.
The cut on Apple Music for musicians is reportedly going to be 71.5% of streaming revenue. Pretty similar.