From this explanation and the image below, do you believe that casino was designed for gamblers to win or lose?
Seriously, man, are you really asking that question? Just knowing what the House Edge is, or the RTP, which is always less than 100 except for some specific and temporary promotions, you already know the answer. Casinos are designed for you to lose, but they give you the chance to win in the short term, at specific moments. In the long run, the math against you is inexorable.