PG is stuck in the awkward no-mans-land between having f-you money and starting a rocket company. He achieved the first long ago, and will never achieve the second, so being a Twitter guru is a reasonable compromise.
From what I know about pg and Jessica, they would have no interest in starting a rocket company - even if they had infinite resources.
Figuring out how to get the smartest people in the world working on important problems (like rocket companies!) is way more their style. And they’re having incredible influence on that even in “retirement.”
