and apparently is only applied to the right
Not really, Trump is quite happy to apply the term to anything he doesn't like - polls, media, facts.
However, if you use 'fake news' only to mean people who deliberately set up fake news sites for money, Jestin Coler claims that democrats just aren't profitable. It's true that fake news stories about Trump have circulated, but they get skewered far more quickly.
SMITH: And Jestin says, at least in the beginning, he was an equal opportunity prankster. He tried to peddle fake news for lefties, he says, making up vile things about conservatives.
COLER: It just has never worked. It never takes off. People will always say - you know, you'll get de-bunked, like, within the first two comments and then the whole thing just kind of fizzles out.
www.npr.org/templates/transcript/transcript.php?storyId=504155809
Of course all media filters news, but there is a difference between bias and making things up.