Yes, exactly. If a group of anarchists puts up spammy websites optimized for TF-IDF, blocking or downranking them suddenly means you are biased against anarchis

Yes, exactly. If a group of anarchists puts up spammy websites optimized for TF-IDF, blocking or downranking them suddenly means you are biased against anarchists. The flip side is that history is littered with examples of rules which seem neutral on their face but which have very biased intentions. For example “literacy tests” for voting, or poll taxes.