Sales, marketing, accounting, legal, and financial controllership are going to skyrocket when this company has a revenue stream that is worth NPV=$19B.

This is a credit to the company; who like instagram was able to build much value with few FTE's. But building a company "worth money" and building a company "making money" are really different things.

This is smart from a founder's perspective, because in a sense all of those other employees would just be dilutive of attention and likely equity. But from an economic perspective, it's jumping the gun a bit to conclude what the steady state economics will be.