What do you mean by the word equivalent here? It means that it is clear that from the beginning in general everyone must gamble with money from their hard work, you yourself decide to gamble and there is no coercion or even threats from anyone including the casino that tells you to get involved in gambling, so of course it doesn't make sense if you think that the casino has cheated you just because you experience a loss with a possibly quite large amount. On the other hand, I am honestly sure that you will never think that you have been cheated by the casino if for example you managed to win, meaning that the assumption of fraud actually comes from within you because you feel disappointed and emotional because you lost while on the other hand it is clear from the beginning that defeat is part of the consequences when you are involved in this activity.
Of course, this causes bad emotions, moreover, gambling can leave a player without money, who has been saving it for years, but the player himself is responsible for this, so there is no need to look for someone to blame except yourself. Other feelings arise, such as anger, so I am not surprised that after losing, players can write on the Internet that the casino is terrible and other things that did not actually happen to him, just to denigrate him. This is something like a protective reaction of the body to the stress of losing.
The conclusion can probably be said that it is a loser or cowardly mentality where they only want to win but are not ready to lose while on the other hand it is clear that from the beginning gambling is an activity about winning and losing and there is no way or strategy that can guarantee that you will win at the end of the game, so defeat should be a result that is considered natural and gamblers should not be emotional when they experience defeat because all gamblers also experience the same thing but maybe with different times and amounts.
On the other hand, as you said, gamblers are responsible for whatever happens to them because from the beginning they are the ones who make the decision to get involved in gambling and they also determine how much bet they will place, so in conclusion this is the reason why understanding and knowledge are the main things that someone must have when they want to get involved in any activity because with this, in my opinion they should not accuse other parties, especially casinos, just because they experience something natural like defeat.