It's honestly crazy how many people can read Dune and completely misunderstand the themes of the book.
Though to be fair, it sometimes feels like Frank himself didn't fully understand what themes he was going for. Books 1-3 were staunchly "Beware of heroes, charismatic leaders will lead you to evil and despair", then in GEoD, we find that literally the only hope for humanity was millenia of oppression by a totalitarian government.
But either of those two takes is still wildly better than "spice saves the universe" lol