The 90-hour weeks part?
The fact that he was doing it for a fossil fuel company?
The fact that he’s worth fucking $9.5 billion?
Also, not in the headline, but-
The fact that he did it back in the 90s when you could actually successfully open a small business and make money from it as if it’s relevant today?
The business is a franchise called Raising Caine’s Chicken, which I’ve never had, but if you go by Yelp reviews, it’s either the best restaurant that has ever existed or pretty mediocre.
Also, Wikipedia says very little about his early life, but apparently his parents could afford to send him to a private catholic school, so he didn’t exactly grow up improverished.
I have yet to see an example of a business diversifying and not getting worse. Find one thing you’re good at and do it well. Leave other things to other businesses.