I completely agree with you, in other words, we can say that cockfighting is simply a game for the locals, its a local game which does not need to be aired or offered up for betting on by the casino on a global scale, even local casinos have not picked up on such games, so its practically impossible for us to see such games on international casinos like Stake and the rest.
Cockfighting is more like a game that brings a small community of friends and family together to have fun, like I said in my previous comment, over here in Nigeria, cockfighting is not popular at all, only a very small part of the country engage in such games, most especially in the north, and its always in very small and local communities, the kind of places we call remote villages.
Any ways cockfight is almost as old as traditional gambling but is just that the game is very unpopular due to the risk associated with it and how many people are actually interested in going through all the hustle just to get a cock to fight each other, the game is not prominent and that why most times a lot of the games as relate to cock fight are mostly done at the tradition level.
You can't see any online contemporary casino listing such games in the catalogue and that is because most players will not be interested in such games since they will be seen asan old school games.
Aside the physical stress that people faced as challenge with the demand needed in getting a desirable cock that can serve such purpose, it has appeared as a gambling whereby gamblers don't see as trending as it could have been in the past, such kind of game may also have lessser odds as compared to other games we could enjoy playing their bets and they have much higher odds on them, all these are are part of what most of the online gambling platforms see that couldn't allow them to give priority in games like this, just as we also like to always blend along with every newly introduced and advanced games, as we know that we are now in a web 3 advanced technology and the gambling platforms are not left out in participating from ay of these new developments, cock fighting is not trending as sport bettings among others.