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.