Along with that I understood that the simulator is different from real-time gambling. When an user play with fake money, it used to bring big wins and the same won't happen when it is played with real money. I don't know whether this is coincidence or this is how the gambling platforms were developed.
With online casinos it is associated with technology. There are dice rolls by common people who just trick the people to have a try and further automatically users will go for real money spending.
I think that even if casino provably fair, they can use different winning percentage for freebets and for real games. In such way they can attract more gamblers who want to test casino with high winning percent but when the game is for real money - they don`t see such results. This is not fair but the fake money costs nothing and no one will answer for it.