Maybe he was lucky. Sketchy casinos can be good for a while or first few times you play there but once you start to run into some problems, then things get tricky. I'd recommend him to play somewhere else.
When ever I want to find some new sites I just try and google them with different ways. Most efficient way of finding them honestly. For example, since I like the offers here, Mr gamble new casinos or Mr gamble new bonuses. You get the idea