Comment by pjc50
They aren't! They're subject to licensing!
https://www.digitaltrends.com/social-media/rap-genius-deserv... (2013)
Long ago the first site I remember to do this was lyrics.ch, which was long since shut down by litigation. I'm not endorsing the status quo here, but if the licensing system exists it is obviously unfair to exempt parties from it simply because they're too big to comply.