I do not see that it is hard to determine which site is good site or scam site, many people here comes and reviews them after play with some money. By reading more their terms and policies you might not be able to know it because they can change their terms as they like. What we need to do now is to believe some reviews, but you should do some analyzation too
Looking for reviews and googling will only work for older gambling sites? How about newly announced site where no one tried it before? It will be very hard for all of us to know it is legit or not because it is hard to find some good trusted reviews.
Mostly we can only know if new site is legit or not by people reviews, not only trusted member reviews, with new member reviews it will be easy for us too. As long as they give us some proof about the new site and everything provided, I think it will be good enough to rate the site scam or not