The 25-year-old "Shake It Off" hitmaker wrote an open letter criticising Apple Music's decision not to pay artists' royalties for streams played while users were on a trial period.
"I had no idea what would happen but I just wanted to say something. I didn't really expect anything to happen at all."
Following the publication of Swift's letter last month, Eddy Cue, the Senior Vice-President of Internet Software and Services at Apple, vowed the company would change its policy.