What? You are inventing an entire in-depth argument that I never made just so you can complain about me.
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So then they adapted characters and settings from tolkien into a TV show. An adaptation doesn't require a novel to do so. It is why poems and other things have been adapted onto film. The movie 'The Nightmare Before Christmas' was adapted from a poem that was itself a play on 'Twas the Night Before Christmas' poem. You say Marvel can do adaptations because they own the rights to those stories and characters while arguing that Amazon can't when they own the rights to some stuff. Why the double standard? It also ignores how the MCU couldn't mention "mutants" and other stuff prior to Disney acquire 20th because of rights to adaptations of characters. Same reason why Sony holds the rights to Spider-man adaptations even though they don't to the comics. Marvel cut a deal with them to have Spider-man in the MCU but can't stream those movies on D+ (in the US at least) because Sony doesn't want it there.