Not just in the filter bubble sense of keeping out any info that the targeted user might find unpleasant, but also in the sense that "we don't surface anything outside of very recent, very mainstream, large corporate sites" even when that's exactly what I don't want to sift through on a given search.
It's a real pain if you're trying to do research in a niche area or in an academic field that isn't hip and popular, if you're not in the 90% bracket of the distribution results for what people click on you just don't exist on Google anymore.
This phenomena is most obvious when you're searching for something that you know still exists on the web, you can remember it being a top result years ago, but has now been effectively eliminated from the results because it's not sitting on the domain of a large corporation. Bing will still surface these sites, at least for now.