@GrapheneOS filmfriend.de is an offer by german public libraries to stream a large number of films for free (limited to card holders of german libraries. If your residence is outside germany, you can create a free account with Goethe Institut, than register online with the public library of Goethe Institut, than login into filmfriend.de). If you try to stream a film with GrapheneOS/Vanadium it will complain about unsupportet DRM.