It's the Silicon Valley circular-reasoning meritocracy in action: those with the billions deserve to have the billions because they have managed to get the billions. Every extra dollar only goes to prove how little they need to listen to those with less.
Not just Silicon Valley, although SV is definitely the poster child for this mentality. It’s a problem all over the world. Obtaining X fully justifies having X. Nobody cares about the “how.”
An aspect of the "just-world fallacy", where ultimately good things happen to good people, so if a good thing happened to you, you must have been good, etc.