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Press freedom index methodology:

The report is partly based on a questionnaire[3] which asks questions about pluralism, media independence, environment and self-censorship, legislative framework, transparency, and infrastructure. The questionnaire takes account of the legal framework for the media (including penalties for press offences, the existence of a state monopoly for certain kinds of media and how the media are regulated) and the level of independence of the public media.

--Presumably the evaluation 'downvotes' the independence and self-censorship of US media?