Mind you, every other station covered it heavily too. The sitting president was impeached over the hunter Biden story
I'm not a huge fan of Joe Biden (as you can probably infer from my comments here https://news.ycombinator.com/item?id=28550896), but the Hunter Biden stuff was a shameless distraction with no real substance.
So to answer your question: if the US MSM and social media was required to run smears of a sitting president against his opponent, the US would be far closer to being a sham democracy.
Uh, that's really not a strong affirmative justification for taking active measures to stop people from using your platform to share a story. And of course the real problem is not simply that the story was suppressed, but that we all know that media platforms do not in fact have a blanket policy against reporting on "shameless distractions with no real substance", and that this sort of post-hoc rationalizing of obvious partisan bias is intellectually insulting.
Cognitive dissonance is a hell of a drug.