Curious. How do you see the system actually working - how do you stop at a billion?

So, let's say you start a company. Then raise some VC money. You start getting users and things are going really well, but you aren't quite profitable. You see a path to that but need to make investments to get there. So you raise another round of money. However, as you are doing well, the valuation of the company is set to three billion. As the founder, you still own 50% of the shares.

You are technically now a billionaire. Of course, just on paper but Forbes will still put you on the "overnight billionaire" list.

What are you supposed to do in this case ? When exactly did you go from "not psychopath" to "psychopath"?