Each is ultimately an expression of will, since there is no objective ranking of what makes something relevant or engaging. Everyone will agree on the order of names in a phone book, but nobody will agree on the "relevance" order of search results.
You see this every day in news-adjacent search topics, where popularity, relevance, and factual correctness can all give different "proper" orderings.
Ultimately, people dislike stances that give disagreeable results, but they think benign stances to be invisible. I don't believe a coherent, legal argument can work this way.
I think the essential disagreement isn’t so much about the choice of bias as it is about the exercise of power, specifically on who’s behalf do you exercise power? Do you do it for your users or for the greater good? Or for your customers? Or maybe your investors? Or maybe your ideals?