From what I understand if an artist refuses use of a song the ad agency or whomever get someone to create a knockoff version.

If i remember correctly Moby sold most if not all of Play for use in commercials back in 2001 (?) just to get his music heard and used it as a vehicle for number of essays about things like veganism.

True or not “selling out” seems to walk a finer line than ever. In some ways the term itself as applied to art is becoming antiquated.