No, this is not some metaphysical question… More a question about music publishing.
Given the case of Gene Roddenberry’s possibly-sneaky Star Trek theme song lyrics, do composers of TV/movie theme songs and other instrumental music create lyrics for their songs, purely as a matter of defense? Granted, Gene’s lyrics were apparently added with the composer’s consent, but since lyricist and composer split future profits, have any other composers added lyrics to their lyric-less songs just to prevent someone else from creating lyrics and usurping half their cash?