How many songs actually get licensed for movies and tv shows out of the millions of songs that are on Spotify? Political campaigns do not have to have a license to use music. Artists have been complaining about political parties using their music forever.

Radio stations have to pay royalties to the songwriters and musicians but not the singers.

No matter how bad or unpopular a movie is, a studio will always make some money on a theatrically released movie, with each of the distribution mechanisms.