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.

My interpretation is that it's very intentionally heavily based off of Fight Club in season 1, but that's just the setup. Now it's what happens after Fight Club. If it were a rip off, you wouldn't have so many Fight Club references and easter eggs. I think it's "sampling" and not "biting." Of course there's disputed gray area, but I think the self-awareness makes it clear that there's a respect for the material it's building off of. There's a lot of American Psycho, Taxi Driver, etc. in there too. It's basically an amalgam of all the mind-bending/character study plot techniques.