This happens everytime between the underdogs and favorites in football games. Yesterday's game between Chelsea and psg is an example. Even though some people suspected Chelsea might win majority thought it was impossible because they were inferior to psg in terms of gameplay and formation but making such an impossible bet benefited those who staked on Chelsea to win. This is what makes betting difficult
Sports betting is always difficult because a surprise result can happen at any time. Sure, the match PSG vs Chelsea was the perfect example. Most people guessed PSG will win the match because PSG looked stronger. It was very reasonable, PSG won all the domestic competitions and UCL. PSG also performed well in the FIFA club world cup. Unfortunately, Chelsea surprised everyone by beating PSG in the final. They even scored 3 goals, meanwhile PSG scored no goal. Even if Chelsea may have lower quality of squad, but they played more aggressively and solidly. They also showed a better mentality of the whole players. This factors sometimes become quite difficult to predict because it only can bee seen during the match. Those people who only consider the stats of the previous matches and the quality of squad, they probably bet on the wrong team.