Online cockfighting was exposed because it can easily be manipulated, and of all the games it is the most addictive because you only have two cocks fighting and your chance is good that is so many of my countrymen have uncontrolled debts, there was even news that bettors resort to robbing just to play on cockfighting.
OP did not mention where he is located but if he is around Asia he will find local cockpits, especially in the Philippines where it is legal, but our government does not want to make it legal anymore because of corruption.
Bettors resulting in robbing happens in every type of gambling, not just cock fights, There is no cock fight gambling in my own country, yet some gamblers were apprehended by the police forces for robbing a small community in the state, The Robbers claimed they owed a lot of debt because of gambling, basically sports Betting, and the only way to solve this was robbing people.
Any gambling games that have something to do with animals can all be manipulated, horse races, Buffalo games, and other animal fights have been exposed a few times before, drugs have been given to the animals to increase their energy, and so on.
Cock fights are illegal in some countries and I believe OP is from such a country, if not, why would he ask where he can place a bet for such a game when it's a game that's been carried out mostly by locals, I believe Vietnam is on the top list of countries that are so into this type of games, Philippines was once a big fan too, until someone came into power and put a ban on this game.