I think that slots are designed to work as slot work. There is absolutely no rigging done in its system. It is working as it is designed by the programmer to work. The problem will often have a gamblers who think that they can outsmart the slot system by trying a lot of things that are ridiculous.
Slots is not how it is depicted in the image in the OP. What is depicted to me is someone without any control of themselves while playing slots as well as other games.
You are right, the mistake lies with the gamblers who often think they can outsmart the slot game system. They might believe there is a certain pattern in the game to get a big multiplier. This makes the gamblers very enthusiastic, as if they want to crack the accurate betting pattern to beat the slot game system.
Furthermore, we also will not know if the slot games are indeed manipulated or not. If gamblers feel that the slots are manipulated and designed to drain them, they will never have proof of that, especially if they also get some small wins.