Yes, it's indeed better if you try the trading competition yourself and conclude whether what many other traders say is true or not. What you gain from the trading competition may also relate to the exchange you use, as well as the competition events that have different rules.
I do not like trading competitions. I prefer regular trading that I can do with my own skills without a target that I have to chase. Those who enjoy trading competitions from exchanges may see profit opportunities, or they genuinely enjoy the competition. I don't know if the profits gained are worth the capital expended.