Scams some times in my own opinion is being overrated and there is need for proper definition of what scam is really is. On this forum, you could imagine where someone will shout scam even for 5$ or for bonus he is unable to cash out without even taking time to understand the conditions attached. For me, a site that is ready to scam will show itself even from the quality of the interface then I ask, will any sane individual, incure this amount of money to build this quality site only to scam few dollars and damage the reputation?
The community is just the best source of information to know whether a site will scam or not after the above has been done effectively.
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
Me too, defining a gambling web site is scams or reputation is not so difficult, that's what we should do when we start participating in a new gambling site. We can consult people in this forum, hear the comments on that site. You can also search by google, see the reviews. And after consultation everyone, we should also learn a little about that site, go through the rules, terms of the site to understand how it works, avoid being scam 
The community is just the best source of information to know whether a site will scam or not after the above has been done effectively.
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