You already know that's not going to happen so why ask? Casinos are not charitable organizations that give money away for free - they are businesses and their goal is to be able to profit from people gambling. When the RTP is 100% where do they get the money to cover operations? And what about the sustainability of their business? That's why there is a house edge to make the casino able to profit from the players and make their business more sustainable in the long run.