I will not deny what you say. yeah, " we can conclude that gambling is about luck, most of the time". like some of the names you mentioned in the world of professional gambling in the field of poker. they really got lucky by getting millions of dollars, and that's why they got what they deserved. But in reality, luck will not come without effort, knowledge, experience and everything else involved. just like this life, everything is related to luck. Likewise with gambling, without luck which is related to each other, we will not win anything. In short, we agree with what you said including sports gambling. But in essence the concept is not that simple, I'm sure you also understand it.
Now we are talking about sports, for example football. When the two teams compete, luck also plays a role. This luck must also be accompanied by effort, which is carried out by the two teams competing against each other. starting from the depth of a team's players, systems, patterns, strategies and all kinds of things carried out by the two teams competing against each other to win the battle. Just like gambling, betting requires experience, understanding, research, analysis, odds, options, and most importantly knowing exactly what we are betting on. After that, we will hand it over to the team that will compete. which team is luckier and also the choice options in our betting. This effort is made solely to minimize losses, without any effort with the variables that we do, it means we are betting only relying on luck. As a result, there are more losses than wins. because we don't try, which we should be able to do with our creativity. just like poker professionals, they need time to learn everything to achieve the skills they want.