I was wondering how does casino affiliates programs work.

I have a friend who is an affiliate marketer. He does affiliate programs for various sectors. For example in the health sector, finance sector, educational sector and so many. It got me thinking after he tried introducing me into it, he is trying to make me change my mind from gambling in 8 ball pool instead i should use the money to get an online affiliate course.

Am curious right now, to know how does affiliates program work in gambling. I know gambling is big niche and they also run affiliate programs, so anyhow have an idea?