If it's just about having access to betting in online cockfighting, that won't be the reason for using DEX to grow here in PH. And I doubt, really really doubt at 100% that the majority of bettors will use DEX or even a much simple interface in Binance. These bettors won't probably spend time doing some extra steps just to place a bet.
If that's the case, these people will just find another gambling type that will suit their convenience. No way I think the majority of online cockfights enthusiasts here will even try to use DEX or crypto-exchange just to place a bet. They will find an agent instead like the usual method used before during the first phase of e-sabong but since currently, temporarily halted, it's difficult to find a legit agent for now.
Gamblers will certainly be able to find other types of gambling that can make them comfortable. If they can find a type of gambling that uses crypto, they will try it after gambling online cockfighting. It is only a matter of time until they can try other types of gambling games and if they see that there are so many crypto-based gambling games, they will be more interested in trying them.