Bill Gates is the most rich person, is because he is a genius. He created the Internet. What everyone goes on everyday, what smartphones are all about.
He made it happen computers, hardware devices. The things we all thought were unimaginably impossible.
And Bill Gates did it!
Now we do not have to sit, and read from books, nor Paper. We can do practicality everything online/computer/Device.
That is why, because of Bill Gates Creation. Made the whole World Change with just one simple creation!