I had a scam that netted me in no change in money whatsoever.
These scammers offer you this "you'll rate these stuff on sites and we'll give you money", after completing a first batch and they give you some money, they'll try to get the victim to believe they are legit. After believing that you're trusting them enough, they pull the ponzi card "for next missions pay us 30-1000$ amount; you'll recieve double after doing them".
I got 30$ from them in total so I sent 30$ knowing it was a scam to see what they would do; of course they blocked me. I was expecting them to try to get more money out of me, appearently they're satisfied with getting their bait back.