It is good to play online games instead of gambling but the problem is that some people want to earn money in easy way and for that they always gamble but the results are always against their well. Online gambling is just a waste of time and money because I have never seen that till date I never heard that anybody won big money in online gambling.
Just by playing online games you won't be winning anything, unless you get some goodies to trade to someone else inside that specific game.