He doesn't believe "the only way to become a billionaire is by exploiting people", and his argument is persuasive. I tend to agree! All those characteristics he's interviewing for are positive, and I think he's a great billionaire scout. Most of the rich people I know got there in ways that don't seem exploitative.
But, he does believe "people who make a lot of money have a moral obligation to use it for the common good", and... isn't that a contradiction? If someone makes their first ten million, and keeps earning more with no clear plans to allocate it to the public good -- are they ignoring their moral obligation? Maybe not yet. What about a multi-billionaire who, years down the road, still hasn't signed on to something like the Giving Pledge? How can we defend the morality of that person?