Those who bet on sports betting will only bet on matches that they know and can analyze. it will show what chance of winning they can get. It doesn't matter what the results of the bet will be, but those who bet on sports bets will not place bets on teams whose strengths they don't know.
Indeed, you can rely on luck, but gamblers also don't just bet on ongoing matches.
Usually, it won't just be one match, at the weekend you can see several big leagues being played, and several bets can be made. The most important thing is to bet when we know the opportunities we can get.
You can't rely on luck when it comes to sports betting, you are supposed to know which side has more chances of winning the game and place your bet accordingly, luck doesn't have that big of an influence when it comes to sports betting, so you can't place random bets and expect to win most of them just by luck, if someone is doing that, they are doing the wrong thing.
Those who rely on luck should stick to gambling games, why get into sports betting in the first place?

Sports betting is for those who know they understand a specific sport very well and they know they can predict the outcomes of the games very accurately most of the time.