I can not name any gambling site on which it is possible to always receive a win as it depends only on luck. Now you can use any crypto currency for the game, but do not spend all coins on entertainment.
You can not name any gambling site on which it is possible to always receive a win because such gambling sites never existed. Victory is not determined by the site but is determined by how lucky we are in gambling. That's it, none of the sites can make us always win.