Normally, you will hardly find a casino that avoided those scam accusations on the web. I think that online casinos use those "scam accusation" schemes as a kind of elbowing as the competition is hard in this area. But in fact, you will hardly find a casino scamming people. Some punters lose money, others break rules. Casino's edge allows those sites to stay alive and even to earn money. I always treat those scam accusations with big scepticism, as they have no real ground at all. A casino may scam you in one single case, I think, when you have won a big amount and they don't want to pay you. But this is a rare case. Normally, casino has enough profit to cover its losses that were caused by a lucky gambler.
Say no more to 1xbit 
so many people already got scammed in this casino, if you want easier to get scammed... 1xbit is your choice 
The fact there's some casinos is trusted enough and really pay the winnings to the players, you can see in this board. They might have a accusations were their players complaints, but the legit casinos will always resolving the cases ASAP. If they didn't resolving the problem and the accusations is legit, their reputations will be ruined just because a single accusations. So it's really a concern to choose a casino who have active representative in this forum.