This advantage is achieved by reducing payouts or changing certain rules of casino games.
The reason why the house is always the big long-term winner is the advantage the casino has over players. If you have invested some time into researching the way this sector is working, you most probably have learnt that the casino always wins in the grand scheme of things.
The gambling industry is usually enjoying great success thanks to the numerous recreational players who simply enjoy the act of risking money and testing their luck on various games.