Why to pay additionally for Contentpass when having a paid subscription?

There is no connection between a subscription to Springer Medizin Verlag and the Contentpass of the company of the same name for regulating cookie settings. With a publisher's subscription, you activate access to paid content, e.g. you subscribe to a journal. With a Contentpass subscription from the provider Content Pass GmbH, you create a tracking-free and therefore largely ad-free reading experience. Any resulting advertising losses are compensated by Contentpass. It is therefore not possible to ‘offset’ or include offers such as ‘subscription including Contentpass’.