There are a lot of players around the world. Not every games are favorite in all region. Some likes soccer, some maybe esports or some cricket or others.
Which one are you mostly placing your bets on? Besides, do you think gambler don't care which sport it is. I have seen gambler who don't have any fucking idea about cricket but he used to bet on cricket.
I just bet on basketball.
I personally don't think that it makes a whole lot of sense to bet on sports that you aren't even interested in/know the rules of.
That way, you have no chance of having an edge over the rest of the market. And you can't even have fun because half the time you don't have a clue of what's happening. Trust me, I've tried the same before.
Exactly that's why I think majority will go to sports what they truly know because as stated we cannot really enjoy what we are betting on if we doesn't like or just trying to risk some amount on random sports, unlike if we know the league and knows which team to bet for sure the result of the game would be more satisfying even if we lose our bets.