Earlier quoted context omitted.
Everything is biased. True objectivity is effectively impossible, and it's not even clear that perfect objectivity is desirable. People will report any negative coverage of their favorite party/politician as biased, especially now that the current U.S. president hoists that banner every day.
Certain content might be more or less blatant about it, and as seymour1 suggests, gathering that additional data and cleaning up the currently actionable data really only has upsides. One avenue would be to put those who report the same things as biased in cohorts, to be shown or not shown similar content.
That just reinforces the current self-silo effect we see, with people only seeing the point of view with which they agree.