It would be one thing if S. Fischer were simply seeking a geoblock to prevent German users from accessing these books. Instead they are demanding the complete removal of these books from Project Gutenberg.
Quoting from S. Fischer's press
release:
"Alle Versuche des S. Fischer Verlags, Gutenberg.org ohne Befassung eines Gerichts dazu zu bewegen, diese Texte aus dem Angebot zu nehmen, scheiterten."
All attempts by S. Fischer Publishing to convince Gutenberg.org to remove these texts from their offerings without involving a court, failed. [translation mine]