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 like placing bets on football at the moment, there is quite a lot of potential to grind out a profit if you do a little research before hand. It's possible to find teams that are on a winning streak, which might not be properly factored into the odds on offer. Going with under/over bets can also be profitable if you start reading the last few games of each team, there has been a surprising amount of low scoring games in different leagues lately. If you're looking at a team who's sat bottom of the table with five losses, versus a team middle of the table with a few recent wins, it's usually a pretty good bet to take. There can also be substantial movement on odds from 24 hours before the game to just before starting so there is room for a bit of arbitrage if you pick carefully.