Private security is mostly an extremely boring, mundane job and they are extremely worried about liability, very risk averse.
This is different than private military contractors.
Funny thing though. With this Citizen nonsense? They might be on mine instead. Bet that makes you sleep better at night knowing those woke hippies might hire "private security" of their own, right?
How about this: let's all get together and decide democratically on how to, I dunno, enforce our laws in a universally acceptable way? We can then hire a bunch of these "law enforcers" together such that they aren't beholden to any part of society, and come up with means to make them accountable to all of us, with like rules and stuff that we can, I guess, amend as we go along. Deal?
You get gangs. That's how gangs form. Organized crime, almost everywhere, has its roots in this kind of "local security" of an underserved disadvantaged population. People who can't rely on the police for order end up under the thumb of whoever can provide stability.
Now, OK, sure. I get that you're thinking that somehow this startup has found a growth hack to disrupt this millenia-old industry and do it better than the Mafia. Well... maybe. Or maybe it's just another gang.