It doesn't, but it certainly doesn't hurt when parents are rich (better access to a lot of things - better education, healthcare, etc).
I'm not saying that, but show me all the YouTube stars making millions who started out poor. Of course anyone can make YouTube videos, but a lot of people out there don't have the time to film themselves playing video-games for hours (and then spend more time editing) when they're struggling for the basics - i.e. finding their next meal, paying rent, worrying about bills, etc.
The fact that he gives to charities is great; I just don't think his is some rags-to-riches story.