Wealthy people are fairly anonymous to most people unless they actually got their wealth via fame (influencers, actors, entertainment talent). Without looking it up, do you have any idea who the CEO of Coca Cola is? Would you be able to spot him/her (I dont' know either) on the street? Now imagine the armies of $XM annual comp high earners in finance and they're even more anonymous.

I don't doubt that but I'd call that hardly secret. Random people in the street are the least problematic, the ones closest are.

The Mars family is pretty famous for how NOT famous they are.