it really depends on the competition
some things are more skill based than others
after all a competition without skill is simply a giveaway (nothing wrong with that too)
I am not talking about skill based games but on a general basis that most gambling games are luck based in which your skills won't matter much so if you are lucky you will win otherwise loss.There are skill based games in which luck factor combined with your strategies can lead to win but not in all of them.
totally get it
and even in some pure luck games you can use skill (most math and probability) to manage bankroll and calculate best odds in a determinate play
many ways to play these games