Honestly, I think the message is completely different. Fight club was about how cynical existentialism leads to pointless disobedience and a conspiracy narrative of the world. Ultimately it was about how misguided and purposeless the disobedience was. Mr Robot isn't about cynical existentialism, its about looking in the right places and pulling of the right sheets to expose actually broken systems. Elliot's early vigilante hacking shows he isn't some broken man angry at the world, but a purposeful actor trying to make the world a better place.