"The cynical, self-serving spin of Springer's replies to Richard Poynder is breathtaking: Is it a sign of Springer's new ownership?
Despite the double-talk, applying a 12-month embargo where the policy has been to endorse unembargoed immediate-Green for 10 years could hardly be described (or justified) as "simplifying" things for the author, or anyone. It would be a pure and simple bid to maintain and maximize revenue streams from both subscriptions and Gold OA. (Note that I say "would" because in fact Springer is still Green and hence still on the Side of the Angels: read on.)
Green OA means free, immediate, permanent online access; hence a 12-month embargo hardly makes Green OA sustainable, as Springer suggests! It's not OA at all.
As stated previously, the distinction between an author's institutional repository and an author's "personal website" (which is of course likewise institutional) is a distinction between different sectors of an institutional disk. The rest is a matter of tagging."