I was playing "Two Dots", if some of you are familiar with the game. But my following lesson can also be learned from Candy Crush.

Success is like Candy Crush - At first it seems easy. Afterwards you notice you have to put hard effort to it. And finally, you notice it's rigged.
Eventually comes a point where you have to use your resources (powerful real-money in-game items) to get to the top, but it will only get much more rigged from there (I personally never got to see that top).