I am failing to see how someone who founded a company that hasn't made > $1B in profit over each of the last twenty years can have a fortune of $75B
Since Amazon began showing off AWS financial figures, the stock has more than doubled. The market has priced in AWS as being worth perhaps $150 billion or more. AWS is making a lot of money, and it's going to make a lot more over the next five years.
Investors likely expect that given the immense scale of the business and the fact that it's still growing at 20%+ (remarkably), the future prospect of Amazon generating, say, $16+ billion in net income, is reasonable to expect. One can then debate whether it's rational to be granting that valuation to Amazon today, if it'll take another ten years to produce the $16 billion annually (pulling future returns forward, the cause of Microsoft's 15 years of stagnation in regards to its stock).