You claimed that PMC is a part of PubMed, but there's nothing that says so. Anyway, NIH-funded research is required to be published on PMC, not PubMed, so the c

You claimed that PMC is a part of PubMed, but there's nothing that says so. Anyway, NIH-funded research is required to be published on PMC, not PubMed, so the cost of PMC is the one to be examined for the question of a mandatory open access policy. So all of what PubMed does is entirely irrelevant to this question, since PMC is where these have to be published to.