I guess anything involving money always works differently than demo mode. I once studied trading and started on a demo account too, and I had good success from the start. Then I thought I knew how to do everything and opened a real account and made a deposit. That story ended identically to yours, I lost money very fast. I guess in gambling it's not much different from trading.
So i don't have this feeling that it could really work on fake money app since it's design to inspire gamblers as well as to enhanced their gambling skills. Though there are much to understand about the fake money app those who uses Demo can clearly understand also know how it is.
It's more better to deal with real account that associating yourself with fake or Demo account which at end would turned to as waste of energy and time.
I think it actually depends. Because to some people, playing in demo mode helps them practice and be better. Demo mode do not involve money so you can practice and strategize without the fear of losing so much because you are just a newbie.
This is what makes you lose money in real account; when you fund your betting account or trading account, there is a tension that helds someone down which includes
1. fear, 2. anxiety, 3. Zealous, 4. Greed, Inappropriate portofolio and you can do it yourself without the help of a mentorship. So it is applicable to betting.