What about the laptop suggested anything unethical done by Joe Biden?

Ultimately that's the reason the story was "censored", it was fake. Something vaguely suspicious sounding about Hunter used to try and malign his dad, and ethical news sites and journalists wanted nothing to do with it.

To this day, there's no evidence of any actual wrongdoing, and even Trump's own justice department failed to charge Hunter, or even continue the investigation, because it was so clearly nothing of note.