The only way any of these business types work is via the greater fool approach. Uber is a great investment if you believe you can find a bigger fool to offload

The only way any of these business types work is via the greater fool approach. Uber is a great investment if you believe you can find a bigger fool to offload the company onto [1]. 1. I am talking about Uber's current business. If they can solve the automatous driving problem before they run out of cash (or fools) then they will be a good investment.