journals - Elsevier open-access fee waived for subscribers? - Academia Stack Exchange

"I have recently been comparing publishers regarding their policies on double dipping (charging an open-access fee for publishing in a hybrid journal and then charging again a subscription fee). Many publishers (Springer, Wiley, Taylor and Francis) state they lower the subscription fees based on the amount of open-access articles to not charge their authors / readers / customers twice for the same article. Elsevier has a different approach. They state: 'Elsevier's policy is not to charge subscribers for open access articles and when calculating subscription prices only to take into account subscription articles – we do not double dip. [source]' But how is this implemented? The Elsevier support team was of no help when I asked there. I only got links to the help pages, which I have read forwards and backwards three times already. I even created an account and started a test submission to two of their hybrid journals but there wasn’t even a box to tick for selecting Open Access. Has anyone made use of this policy and asked for a waiver based on a journal subscription?"