Bio is right on the stored journey based slots. So kingmaker for example you spin and it collects multipliers. when the casino verifies you have the funds in your account and sends the spin request to the game provider it tags in your unique player ID. This is just a set of numbers, our for example on kingmaker would be RBTG5981282 or something. Relax BigtimeGaming then the player ID. The providers sends this result back with the same code and it tracks like this. Clever really.
Some slots work in every different ways. the best example is Jammin Jars. As this slot was so hard to make, they only game us with i believe 1.6million win rounds. So you will see the same results often on streams, a video was made on this. That game is more of a very fun scratch card. The RNG will select a result and one of those 1,6million win rounds will be shown, or its one of the many more loss screens. Compare this to Book of Dead, where the game can do any random event of reels and symbols based on what the win will be.
I prefer to think of it as a roulette wheel with 1billion numbers. Some of those are 0. Some are 1x. Some are 20x. A few will be 5,000x. Whichever one the ball lands in when you press spin will give you a visual image of that result.
And just incase anyone asks again – no the casino has no effect or possible control over the game result
