If there are 100 people that have not gambled before but about to start. If they tell them to gamble and people are seeing them while gambling. Not all of them would first win. Some people will win while some people will lose. I know someone that gambled for the first time that lost the game immediately and he told me he is no more gambling again.
It doesn't matter whether are new or old to gambling because winning from gambling requires luck and good analysis. Those who can analyze well, especially those who have a good idea about the sport, who know about each player and can analyze the matches well, it becomes much easier for them to win. Now if a new gambler can analyze well, he will win first, in this case he will not be defeated because he is new. I have seen for myself that I understand sports quite well, so when I bet, I analyze both teams well, so it becomes much easier for me to win. However, it is true that if 100 people participate in gambling together, not everyone will win because not everyone's luck and analysis are the same among 100 people.