I might not like airport lines but I'd hate to be forbidden from going through that process. I also couldn't just walk down the street to get a pizza. Or go out dancing at night. Or to play board games. Or take a random walk or bike ride around the city. If I was rich and everyone knew it, I'd have to live in a bubble.
That's different from "comfortable rich" where you own your own home and a retirement fund and live mostly normally.
If asked he could say he works for a company that makes some computer part.
“Are they well known?”
“Kinda, but mostly datacenters buy them, you probably don’t own one.”
Well, not necessarily. Jensen Huang was famous for going to random food stalls in Taiwan and eating street food.
It might be harder and riskier, and I get what you mean, but it's not like you actually can't do those things.
Also maybe it's not necessarily a billionaire thing, but more like a fame thing. Billionaires tend to get famous just due to being rich, but I'd imagine a random person wouldn't recognize 80+% of the people on the billionaire list if they saw the billionaire chomping down a pizza in the local pizza place.