I do not gamble at all. I'm a very adventurous person and I'm afraid that I could lose a lot of money there because it would be hard for me to stop.

 But my friend plays in various online casinos & crypto-casinos too. He says that sometimes he wins, sometimes he loses. But if you evaluate in general, then he will receive more than he gave.
I know there often give out some kind of free invitations to interest new players.