I think that's more a problem with being famous: the top of the Wikipedia list* as I write this is "Bernard Arnault & family", who I've never heard of and therefore couldn't spot in a lineup much less a crowd.

But I did double-take when walking past Russell T Davis (or a lookalike) in Sheffield a decade and a half ago, and Richard Osman in Cambridge train station some other time.

* https://en.wikipedia.org/wiki/The_World's_Billionaires

That's why I said "if". Some billionaires are not well-known publicly, and then there's Elon Musk or Bill Gates.

Indeed, though I think he likes it that way, and that it's a choice.

There are 2781 billioners in the world (according to first search result).

I'm fairly sure most of those can go out for dinner or drinks and no one would know who they were.

Hire your own public and make them act normal when you’re around.