Here in Serbia, everyone bets on popular games, and the cock fighting (just one example) is not popular here, but in illegal circles there are some dog fights. Still, I wish to discuss just "legal games" with available markets in some casinos. I guess a lot of people heard about these games from the article, but I didn't know that people actually bet on something like this. So I am interested if there is anyone here who bet on "not popular" sports/games, maybe some description, and where we can learn more about that game/sport.
Gambling is not easy and there is no escape route unless we are deceiving ourselves, it will get worse looking for extra games, especially if we are not familiar with them. We have thousands of games to choose from already, they may be popular or relatively popular, it doesn't matter, for me, they are enough to give us the winning we desire, or stress/frustration of their own as the case may be. This is because they will always rely on luck to win. So if I should advise you, I would only say that you should be contented with those you already know and not further look for gambling troubles.
Per country and culture, there are a lot of weird activities going on which include gambling and as you call some animal fighting games illegal in some countries, it is legal in many other countries. In mine, there is enough cock/bull/ram fighting where people will gather in an informal setting to place their bet. It is always fun but no one can know the winner, it's all about luck, so what's the difference?
The same goes for a particular game called "ayo olopon" in my country, one may bet on either side playing, but still, no one would know the winner, that's how tough gambling is.