These days, most bitcoin & altcoin casinos already using provably fair.
But, casinos still have many tricks to get money from their player such as house edge or games which could make gambler addicted.
House edge isn't a trick, it is how every casino out there is in business, including non-online casinos. But I agree, I think that at the end of the day you have to find a reputable casino because even the PF system has been gamed.