Ball gambling? Never heard this type of game before, would you mind to tell more about it?
Frankly speaking, there are two games in my mind when I read your word "ball gambling". First is plinko game and second one is sports betting where you bet on soccer.
So which one you are referring to? Or maybe it is not between both that I have mentioned?
That should not be sports betting because he was saying that these type of games can be won by pure luck alone and we know sports betting is based more on your ability to analyze games so it's should be skills over luck when it comes to real chances.