This is only a marketing move, just like that, he ended like the good guy, but the reality is that he just use the charity to promote his channel and get subs, which is a cruel move, but it works.
If he really antes to do a charity move, the he would donate the bonus buy money to the charity, and not risk the money on gambling.
Truly, that's most of the cases right now. Using charities to boost the number of subscribers, views, and likes. Well, people can get easily affected by such a kind move but I disagree with showing it to the people by means of videos or photos.
I have heard this many times "If you want to help, you don't need to record it.". I strongly agree with that kind of belief because there are people now who are only using those kinds of things for their own profit.
Still, it looks to me like both father and son do want to help because the Dad said that his Pops was involved in that charity for a long time so I guess they are just continuing what he started.
Using gambling though, I don't know if that's a good idea.