Not necessarily in the wealthiest areas
That you need to point this out illustrates my point: the private security armies are there to protect the people who pay them and their interests. If the boss has interests in a less wealthy area, that might be protected too. Maybe.
That's not law enforcement, that's an anarcho-capitalist nightmare!
No, I'm framing it in a "rich people look out for themselves. That's how they became rich" context that's true worldwide.
No, I'm saying that since the rich are the ones paying, the rest only get security if it pits the interests of the rich people. That poor people's interest sometimes align with that by happenstance doesn't make rich people de facto owning the police a good idea. Especially not when the rich people themselves are committing crimes.