A) An LLM does not inherently sell you anything. Some companies charge you to run and use their LLMs (OpenAI), and some companies publish their LLMs open source for anyone to use (Meta, Microsoft). With neural chips starting to pop in PCs and phones, pretty soon anyone will be able to run an open source LLM locally on their machine, completely for free.
B) LLMs still rarely regurgitate the exact same original source. This would be more like someone in the back alley putting on their own performance of the movie and morphing it and adjusting it in real time based on your prompts and comments, which is a lot closer to parody and fair use than blatant piracy.