On December 14th, 2017, the FCC, led by Chairman Ajit Pai, who was appointed by the President Trump, adopted an order and fundamentally changed the framework of the net neutrality regulation that former FCC chairman Tom Wheeler strengthened by the Title II order. This is not only the result of the conflict over the meaning of net neutrality and its achievement method, but also the result of policy response to changes in the broadband ecosystem. This paper describes the transition of net neutrality regulations and analyzes the relation with the evolution of the broadband ecosystem behind it.