On many bonus game a paid bonus is offered, when closing, are you sure, another close. Back in the main menu, coin offer. Close. Get VIP for 9,99, close. Start a game, offer to buy some extra, close. Direct another pop-up to buy something else. Spin 10 times, offer to pay to complete the quest.
And why would some buy 600M for 4,90 with 6B on credits?
When quest is almost finished, slot stops paying wins. Every time. What a coincidence just to get you broke and buy.
It is a pity as the games and graphics are really cool.