Just google 1win scam , 1win doesn't pay and you can read hundreds of cases.
And there are also thousands of testimonials that prove that 1Win is paying its players who deserve their winnings, and for your information, there are such things as sore losers who will malign the casino they are playing because of their losses. I already mentioned that Trustpilot removed a number of fake reviews, preferably from unverified reviews, many of which are fake negative reviews.
If you think you've been scammed, then the burden to prove is in your hands; show us something.
Problem with these accusers they just come up here and post something negative on the casino without posting anything that can support their allegations. If they just practice to grab an evidence before showing up here maybe people would believe on those things they are claiming.
But unfortunately they didn't provide those things needed that's why lots of people assume that they are trolling 1win. So far I know this casino as big player in the market since I always see their ads everywhere. To be honest I got surprised when they come here and compete with other top crypto casinos which already exist for long time in bitcointalk.