Involving "academic freedom" when arguing against Plan S feels disingenuous.
Academic freedom is important because we do not want funders to suppress results of academic research that does not suit their world view.
That is not likely to be at risk when funders demand publication in OA venues, however. Rather, when the term is used in this context, academics are not afraid of their research being repressed, but for their career progression.
It is a legitimate worry. However, career progression being hampered is a different problem than suppression of research, and tolerating research behind paywalls is not the only possible solution.
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