You can't just write an unlicensed harry potter book, or make an unlicensed sequel to Fast and Furious. Why would you think it's broadly permissible to rip off

You can't just write an unlicensed harry potter book, or make an unlicensed sequel to Fast and Furious. Why would you think it's broadly permissible to rip off someone's comics (which have an identifiable style but also characters, etc).