Are they earning (collectively) $260 billion? Are they earning anything like a significant fraction of $260 billion? Is the amount they collectively earn, whatever the total, coming out of Jeff Bezos' wealth, subtracted from it, or are they paid out of several different funding streams such as the government contracts and commercial revenue?
And you think this is somehow some sort of gotcha question. "Look, I've proved that Jeff Bezos has $260 billion!" (or whatever the amount was supposed to be). You're unable to think clearly or correctly on the matter. It's scary how confused you are.