A lot of threads in gambling section are basically dedicated to scam accusations. They can be seen every day on the first page. The casinos about which people complain are usually new or known to be scamming people (one can easily check out the trust of members leading the respective ann threads to be assured in that). I don't understand why people deposit money onto new casinos and then complain that they scammed these people. I mean, there are lots of very trusted casinos offering a wide range of games, so why not to keep playing at them rather than some unknown risky ones?
I guess they were going for a bigger profit. New casinos entice their customers by offering discounts, big cash-out, or any tricks under the sleeve to hook the poor investors. Established online casinos don't offer like that, with that sense gamblers tend to look for other options.