In her letter, Swift decried Apple Music's free three month trial policy, during which they were not going to pay royalties for playing any music. Apple is offering the free trial to entice users to sign up and eventually pay for the streaming service, but weren't going to pay the musicians, writers, producers and others who would be owed royalties, during the trial.
In her letter to Apple, Swift said of Apple's decision,
“I find it to be shocking, disappointing, and completely unlike this historically progressive and generous company [Apple].”
Swift went on to say,“Three months is a long time to go unpaid, and it is unfair to ask anyone to work for nothing.”