Are you confusing libel with something else? Can you extrapolate what you mean here? Are you saying that they will be liable for libel (!) if they publish a negative summary of a product?
If they mischaracterize a positive review into a negative summary based on factual mistakes they know the system makes at a high rate, I would think they would be liable for libel right?
Maybe under UK "judgements widely banned from enforcement" libel laws but it would be basically impossible for ML to fall afoul of it in the US. It could not even be knowingly false. Reckless disregard for the truth would also be hard to argue as it is meant to be a best effort in accuracy.