1. This youtuber isn't a gambler, all of his videos are only reaction and discussion about chronicle, daily life etc etc.
2. Look at his comment, he's promoting to register using his referral (paid promotion).
3. Is there any stupid person want to guide you to earn easy money? Obviously he wouldn't tell anyone and continue to earn more.
1. Yes it is true and it is a fact that there are many youtubers who are promoting product that they do not even use including gambling product, trading product, etc as most of them cares about the offered money by the product only. Even worst some youtubers especially this youtuber in the screenshot by OP do not care about the risk of what he is doing.
2. Another additional money if he can get referrals from his viewers so it will give him much more money. 1st is from the paid endorsement and 2nd is from the referral commission.
3. If I have an easy way to earn money, I will use it myself till I get a lot of money then I may share it to others lul.