The problem with that thinking is that his wealth wouldn’t be possible without a ton of other people’s work. His work relied on hardware and other software, and was built on the work of his predecessors, like all software is. He certainly came up with a good product and did well with it, but it wasn’t done in a vacuum. There’s no such thing as a “self-made” billionaire.
I can’t believe that anything that one person produces is worthy enough for a billion dollars. It’s like saying it’s worth more than a year’s worth of work from 65,000 people (based on min wage in the US). Nothing can be worth that much, in my opinion.