Slot machines are able to program the win percentage of the game. If it is 90%, over a great enough time you will end up with 90% of your money back. The casino pockets the rest. I believe there limits to how low this percentage can be and some places it has to be advertised.
Card games and roulette generate these percentages from the maths behind the rules. There being two greens gives the house 5.25% of the money inputted. The dealer in blackjack has favourable odds so will win more
Slot machines and similar mechanisms are overseen by a Gaming Control Board or similar government body, ensuring they are fair and random. If a casino is caught tampering with their machines they risk severe fines and even the loss of their license to operate. There isn’t much incentive to cheat considering the risk involved and the fact they are always going to win and make money on average anyway.
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