It's actually no longer a new thing or knowledge to me that demo version of every gambling game is designed to lure the player into wanting to play the real game where real funds is involved.
I have played a lot of demo versions of casino and slot games, and they all gave me the same experience, which is that winning is very easy, I literally have won over a hundred thousand dollars with a bet of $10 in a demo version of one slot game like that, experiences like this is only to lure the player into playing with real money, because they themselves know that $10 for over $100,000 is not impossible but very rare.