I'll start by saying that casinos are not recommended at all, neither for recreation nor for any other reason.
In response to your question, there are large casino brands that are reliable when it comes to paying out and risking your money. ALL casinos, without exception, use their bonuses to their advantage, and if they have to make up rules on the fly to take advantage of you, they will (I'm only talking about bonuses, not your own money deposited into your wallet).
Regarding the games, slots are random, as are blackjack, roulette, and others. THEY ARE GAMES OF CHANCE. Slots can give you a big prize with a low bet (my biggest win: with a $25 bonus, I won over $1,000). Live roulette offers a different sensation where, with more players, you feel you can win just like them while others lose to pay out your winnings; the casino never loses (I don't remember my biggest win, but it must have been around $300 with a bet of about $10). Blackjack, on the other hand, doesn't offer huge winnings, but it does offer a higher probability of winning. I don't play, nor have I ever played, because I've always preferred to risk winning more money than just doubling my bank account. As a matter of fact, even I have played on a casino
website with fast payouts. I repeat, it's not recommended to play at a casino. I'm trying to quit, and all the winnings mentioned above, and more, are a good thing. Those were losses within the casino. It only leads to addiction, wasted time and money, plus problems it can cause in your life.