Just google Fight Club and Mr. Robot. There are plenty of interviews with the creator of Mr. Robot where he explicitly discusses the Fight Club connection. Straight from the horses mouth.
I don't have a problem with referencing other works, but it's got to the point of a simple rewrite.
Fight Club: A prototypical, disillusioned male worker with daddy problems has a psychotic break causing him to make an imaginary friend, and this immaginary person pushes him to destroy all debt records to set everyone free to have a fresh start. In order to do this they start an undetground club that collects members who band together to accomplish this task, who are not totally in the know regarding the immaginary friend. In the process one of the main members of thr club is shot in the head and dies. There is a woman who has a very close relationship to the main character, who is central to plot development, who is portrayed as being very antisocial and rowdy.
I could go on. Sound familiar?