Google in particular left behind the excuse of "we just serve what's already available" when they started weighting results for political and commercial gain and labelling things as factual. They clearly do not act as a dumb pipe for information gathering.

IMI, as soon as they started exercising editorial privilege on data they serve, they became responsible for this kind of thing. Uncensored search results can only come from an engine that isn't censoring for their own benefit anyway.