I heard that many of the crypto casinos were really considering it for a while, but in the end they were just chickens hahahaha 
Crypto casinos will never add a cockfighting option to the betting options they have because this is the same as horse racing which uses animals for competition but cockfighting seems more cruel because the owner brings two chickens together to fight until one of them is completely helpless or even die on the spot.But few days ago I had access to a fiat casino owned by several countries in Asia and there was a cockfighting option there and the betting method for the winner was usually by using color and usually it was (meron) or red and (wala) or blue.
I tried betting but failed I lost some money from this bet it was really ridiculous and it was better to bet directly by watching the cockfight openly.
That will even be more easy and acceptable compared to the few traditional physical events where cocks or other animals are meant to fight in a bloody manner that sometimes results in injury or even loss of the animal life along the line.