I think for most games the dopamine hit will determine how much people keep on playing or not
if it's really addictive, has intermittent rewards and is a bit unpredictable without being too hard it has some of the important ingredients to hook people
besides crash which other games do you think have it too?
Slots have it too especially when the gambler hits the bonus round and the bonus round delivers, the gambler would have been highly excited on how high would be the result of the bonus games is. Aside from that slots also have the feature of being unpredictable, with different variations of rewards ranging from nothing to massive wins that keep people in playing the game.