Casinos always lose more than they win?

Is there any basis for always losing more and winning less in the casino?

I often hear friends who also like to go to casinos share that no matter how many casinos they change, whether they are online or on site, they always lose more and win less. Why ?
Why does such a situation appear in a game that seems to rely on luck ?
I have also seriously thought about the reasons and often discuss with experts on the internet .
Through these researches, I think I have found an explanation for this. This time, I just took this opportunity to share !
Suerte gaming as the top three in the Philippine game sideline. The game designer adjusts the odds and the number of games respectively, in order to let all players have the best gaming experience and use a small amount of money to make a big prize.
The top games of the most players in Suerte gaming are

1. Slot Games
2. Live Games
3. Fishing Games
4. Sports Betting
5. Poker Games
6. Cockfight

I believe that all players will have a good gaming experience in Suerte gaming.