Springer Nature removed two studies by Max Planck, and despite the removal, the publisher is still selling the empty PDF for $39.95. The exact reason for the removal is unclear, but it has sparked a discussion about the state of scientific publishing and the role of for-profit journals. The removed studies are no longer available, and the publisher's decision has been criticized. The incident has highlighted the issues with the current scientific publishing model, including the high costs and restrictions on access to knowledge.