There have been so many accusations and counter-accusations on the subject matter of fraud so many players have come out with evidence of scams against some sites while the operator of those sites come up with counter-accusations that players violated their T&C.
I think it will be proper if an online accredited court is set up to judge such cases, rather than leaving them uncensored.
A court is a legal mechanism set up that can enforce laws within a certain jurisdiction. As there are over 250 countries around the world with different laws, what you are suggesting is almost impossible to govern and agreement will never be reached in the way that you want. It might be illegal to play the lottery in one country, but is completely acceptable in many others, if a player from a country where it was illegal felt someone was wrong with the lottery then how would they dispute it? They weren't even meant to be playing in the first place. There are so many legal mismatches and complications that it is completely unrealistic, besides that it would in most cases be a complete waste of money - the figures in dispute are often at such a low amount it would not be worth the resources to pursue a case. Any people who are disputing large amounts are able to do it between countries, it just costs them a lot of money to do so and is also probably not worth it.