The slope is very slippery. It is very easy to put forth an argument that some left/right wing media "[adds] nothing to the world and [leeches] attention from everyone"
Keeping the focus on blatant spam sites is a noble cause, but this tool is as easily misused as a firearm.
Let me be more precise, and use tptacek's words in https://news.ycombinator.com/item?id=12999887: "fake news = spam sites built from scripts consisting largely of a backcatalog nonsense stories [...] with a one or two carefully produced fake stories as a "payload".
I think this definition is as objective as it gets, and clearly excludes things I might disagree with politically, but are not the target of this extension.
I think the reverse assumption - that everything should be considered a valid information source until conclusively proved otherwise - is probably a more dangerous bias than assuming that some media does add nothing to the world.