It would be required just once or it would be required anytime that you want to gamble? If it is just once, it will not be annoying. If it is everytime that you want to gamble, that is rubbish and it could be frustrating to some people.
I think it is just once in a single day but if you gamble daily, it's annoying; it will ask for a selfie if you want to gamble every day.
The good thing is it would prevent minors from gambling because it requires a selfie of their parents before they can gamble at any of the casinos from the GCash app.
However, I don't feel that it would help to reduce addiction; it might be better if GCash removed most of the casinos from their platform or restrict them how much they can lose.