Refusal to moderate, though, is also a bias. It produces a bias where the actors who post the most have their posts seen the most. Usually these posts are Nigerian princes, Viagra vendors, and the like. Nowadays they'll also include massive quantities of LLM-generated cryptofascist propaganda (but not cryptomarxist propaganda because cryptomarxists are incompetent at propaganda). If you moderate the spam, you're biasing the site away from these groups.