I have deposited $550 with them over the last 18 months or so... just playing for entertainment after work. Though many times games were interrupted and ended early, I never bothered e-mailing support. I just let it be.
I realized long ago that your skills don't matter. For example if you play Dynamo (or something like that) you can literally see how the ball you shoot just changes direction to miss where you aimed. Sometimes it is so bad, it's as if someone else was aiming for you (and missing). No, there is no skill involved, you just get to win when their bot thinks its your turn and lose most of the time. Many high scores cannot possible have been achieved by a human player.
But worst thing is... a few days ago I tried to make a $10 PayPal deposit and was told there was an issue and the deposit could not be made. I tried 2 more times with the same response. I checked my PayPal account and there was no problem, the money was taken out 3 times, but not deposited at world winner. I was upset, I like to play in the evening and my deposits were held leaving me no way to play. I e-mailed support, the first time in 2 years, and was told they are busy and will get back with me usually in about 2 days! I was really ticked off about that and went to PayPal and put claims on all 3 Payments so they would see the amount WAS indeed paid.
The next day I found my game account had been closed due to fraud! And to top it off they responded at PayPal that they credited the $30 to my game account and I need to close the disputes... while I couldn't even SEE my game account because it was CLOSED!
Anyways, thanks to PayPal they had no option but to refund and I will play elsewhere.
I do still have my second account with them but I would never deposit money again.