Springer Nature will no longer help authors publishing via the subscription option to comply with the NIH PubMed Central mandate, shifting the burden back to them:
"We are getting in touch to let you know that Springer Nature will no longer be able to provide a manuscript deposition service via an automated feed for accepted manuscripts of journal articles published via the subscription route to PubMed Central (PMC) and Europe PubMed Central (EPMC)."
