I had to laugh at the revenue estimates based on the peak of a brief social media buzz. Most of that traffic will disappear over the next few days.
My "show HN" went peek on HN and then back to what it was before.
He is smart: Everything seems fine. From the media we know about all the companies, which have established business models with such figures. But they are the 1%.
Taking over (from him) is already so hard: If you were the inventor of [X], you would have done [X]. Taking it over and going on: ~IMPOSSIBLE~