There is no logic to this. A big whale can stop playing in a casino for many reasons: maybe he has tried another casino and likes it better, for example. If you have been betting for some time and know a little about the subject, you will know that winning in a casino is not a guarantee of continuing to win, on the contrary, by pure mathematics, the more you bet, the more likely it is that you will lose because of the House Edge.
Gamblers are same as people, as all of us. We can find new interesting things any time. With gamblers, whale gamblers, they can move from one casino to another one if they find new interesting game and see better opportunity to enrich their portfolio. It's their money, it's their choice and decision. They don't have to bind themselves with a single casino many years.
this is the world cup which is held 4 years so it's not as easy as how to play in the league, everyone will work hard for that struggle because it brings the name of the country too, look at the previous lesson where south korea beat germany, so nothing is impossible in this world cup because all deserves to win, so of course betting on the world cup is very difficult to guess
World Cup is a biggest tournament in football and competitive level in World Cup even is bigger than Euro. In World Cup, there are big teams from Latin Americans like Brazil and Arghentina. In addition, teams from African and Asian continents can make surprise too especially in the globalization era.
In the past, teams like Cameroon, South Korea and Japan made many surprising achievements. The intensity of surprise would be more regular because countries from African and Asian will have more players who are able to play and become stars in Europe. These successful players in Europe will be main power for their national teams in World Cup like Son Heung Min.