I have not seen any crypto based casino where it is possible to operate any such casino games. The main purpose of the casino is to do business. If they intend to conduct such an event then of course there will be more potential for them to lose. Because a casino must spend a lot of time to run such games which will definitely not be profitable. These games are limited to certain countries which is why they are not supported globally. Moreover, many people will not accept it because of the possibility of harm. I have seen Cockfight but I have not seen any such artificial event.
I think due to the unpopular nature of this game is the reason why most casino doesn't have it on their game schedule and the cost of implementation vs. the potential profitability from this game is indeed on of the reason also why some casino never consider this game to be worthy to get listed on the casino.
Cockfight is a traditional game, and even at that level, most places around the world don't still know the game and that is how unpopular cockfighting is and for that it may not be familiar to a lot of people, so developing it to the casino will mostly take money out of the casino without any potential profits to warrant such developmental cost.