So how do the scam « play games for cash » actually scam you?

I’ve been absolutely inundated with these ads on my socials. It’s almost always a woman checking out and she doesn’t have enough money. So she whips out her phone, plays for 2 seconds, and now has all the cash she needs! (Sometimes it’s an interaction with another person where she « tips » them by downloading the game so they can have unlimited cash too – all for playing solitaire etc!!!)

Now obviously it’s a scam, I’m just wondering HOW. Do you enter your back account and they drain it? Have to pay to play the games and like a casino you never win back what you spend? Other? I just want to know at this point….. Incidentally these ads almost always say « unlike those other games where you can never get your money this downloads straight to your bank account/paypal » which implies at least how some scam you.