Blackjack has the best odds of winning, with a house edge of just 1 percent in most casinos, Bean said. Plus, you are playing against only the dealer, not hooded poker champions.
Yes, online casinos do actually payout. Legal online casino apps and sites take the extra steps to ensure that all the available games are tested and audited for fairness so that every player stands an equal chance of winning.
The jackpot is triggered by a specific combination of symbols on the reels. When you pull the lever or push the button, the random number generator generates a mixture of symbols. If the given combination matches the jackpot combination, you win big time.
I once was sitting by a young woman who was saying to her machine, "Don't MAKE me go to the ATM," as though it was a threat to the machine. A more serious answer to your question is, there is no rhyme or reason.