if I was him though and was out of the house and my dad was micromanaging how I use my money (I guess I don't know if you are still supplying money) I'd start a new bank account that next day.

I'm very anti gambling, I don't even go to my works mock gambling parties. I'll listen to and heavily weigh my parents counsel, but I wouldn't let them be in a position where they could block my bank account access if I was spending the money I earned in a way they didn't approve of.