Soccer or football has the most fans around the world and that makes it the most popular sport for gamblers. With approximately 4 billion fans around the world, assuming half of them placed a bet with every game, thats still a huge number of gambling supporters of the specific sport. I'm not a fan of football, but everybody notices how their fans loudly celebrate during the world cup.
I only know the game of basketball which I usually place my bet on, may it be fiat or crypto.
I personally like to bet on soccer matches too since there are so many options available then any other sport.
I like to bet on corners other than goals or a straight main line bet.
People do like to wager on the amount of fouls which are committed and if a team will receive a red card or not allowing the other to have a one man advantage for the duration of the rest of the game.
Another wager is if a team will have a clean sheet or not meaning if they will be scored on.
These bets are too difficult to predict so I have not used these options before for my bets. But I prefer to bet on soccer then any other sport for these reasons.