I downloaded and installed GG Poker a couple of years ago, for no other reason than they were APAT's sponsors. GG gave me some free tokens to play various games and tournaments including their version of All-In-Or-Fold. It wasn't my favourite variant and it took me a while to get my head around it, but once I'd developed a formula/strategy for AIOF, it became reasonably profitable. I wouldn't exactly say that AIOF is an ATM, but casual players are certainly exploitable.
I deposited $25 at the start and together with the tokens I managed to spin it up to $400.
The third time in 12 months that GG asked me to verify my details with passport and utility bills etc, my patience expired... I withdrew it all and uninstalled GG.