Wouldn’t the staff of a billionaire bunker just take over?

So I’m assuming that in the scenario where you have had to hole up in a bunker in New Zealand it is a result of a significant societal collapse.

I’ve only met two billionaires so it’s a small sample size - but they didn’t cook their own meals or grow their own produce (afaik), couldn’t repair or maintain anything and had a fairly limited/specific skill set. In short, in the event of a catastrophe it seemed like they would not be able to survive on their own.

Presumably then, their bunker is designed to have a bunch of maintenance staff, cooks, cleaners, gardeners, security and so forth. What would be their reason to work and why wouldn’t they overthrow the billionaire and family?

I can see for a short term event that there is a financial and legal incentive, but the scenario that puts a billionaire in a bunker is likely to be unresolvable, as for anything else they can probably find somewhere globally to ride it out.

TLDRNSQ- what stops the staff of a private bunker from killing and eating the owner?

EDIT: thanks for the ~2k responses! I have read all of them. The general themes (amongst others) are “hell yeah those guys are first against the wall”, or “people aren’t going to start overthrowing their boss just because they are in a bunker”, or “explosive shock collars”. There was quite a few suggestions of family being in the bunker to provide control- I’m not sure how many people are in an average billionaire’s bunker but I’m now down this rabbit hole and hope to find out from the next book read (see below).

A lot of people recommended watching Triangle of Sadness, and reading Survival of the Richest by Douglas Rushkoff. I’m currently reading The Future by Naomi Alderman which was another recommendation.