not always what you say is true, casinos are a business and it is very natural that they are looking for profits but many of their players also win and make money from bonuses and events. last december, when the world cup was held, coinplay also ran a world cup event, of course there were players who won the event.
Everyone wants to try how lucky he is, that is why casinos are so popular and people continue to play them even when they lose money. If it would be impossible to win money in a casino, then people would not play in them. Each player hopes that he will win money.